diff --git a/browser/brave_browser_process_impl.cc b/browser/brave_browser_process_impl.cc
index a15bf9c044a9..8b184a08a127 100644
--- a/browser/brave_browser_process_impl.cc
+++ b/browser/brave_browser_process_impl.cc
@@ -27,7 +27,6 @@
 #include "brave/components/brave_component_updater/browser/brave_on_demand_updater.h"
 #include "brave/components/brave_component_updater/browser/local_data_files_service.h"
 #include "brave/components/brave_referrals/browser/brave_referrals_service.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
 #include "brave/components/brave_shields/browser/brave_farbling_service.h"
diff --git a/browser/brave_shields/ad_block_service_browsertest.cc b/browser/brave_shields/ad_block_service_browsertest.cc
index 2576bb2db87e..aa40c4efa434 100644
--- a/browser/brave_shields/ad_block_service_browsertest.cc
+++ b/browser/brave_shields/ad_block_service_browsertest.cc
@@ -19,9 +19,9 @@
 #include "base/test/thread_test_helper.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/net/brave_ad_block_tp_network_delegate_helper.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_custom_filters_provider.h"
 #include "brave/components/brave_shields/browser/ad_block_engine.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager_observer.h"
@@ -92,10 +92,7 @@ using brave_shields::features::kCosmeticFilteringJsPerformance;
 AdBlockServiceTest::AdBlockServiceTest()
     : ws_server_(net::SpawnedTestServer::TYPE_WS,
                  net::GetWebSocketTestDataDirectory()),
-      https_server_(net::EmbeddedTestServer::Type::TYPE_HTTPS) {
-  brave_shields::SetDefaultAdBlockComponentIdAndBase64PublicKeyForTest(
-      kDefaultAdBlockComponentTestId, kDefaultAdBlockComponentTest64PublicKey);
-}
+      https_server_(net::EmbeddedTestServer::Type::TYPE_HTTPS) {}
 AdBlockServiceTest::~AdBlockServiceTest() = default;
 
 void AdBlockServiceTest::SetUpCommandLine(base::CommandLine* command_line) {
@@ -150,26 +147,10 @@ HostContentSettingsMap* AdBlockServiceTest::content_settings() {
 
 void AdBlockServiceTest::UpdateAdBlockInstanceWithRules(
     const std::string& rules,
-    const std::string& resources) {
-  auto source_provider =
-      std::make_unique<brave_shields::TestFiltersProvider>(rules, resources);
-
-  brave_shields::AdBlockService* ad_block_service =
-      g_brave_browser_process->ad_block_service();
-  ad_block_service->UseSourceProvidersForTest(source_provider.get(),
-                                              source_provider.get());
-
-  source_providers_.push_back(std::move(source_provider));
-
-  WaitForAdBlockServiceThreads();
-}
-
-void AdBlockServiceTest::UpdateAdBlockInstanceWithDAT(
-    const base::FilePath& dat_location,
-    const std::string& resources) {
-  base::ScopedAllowBlockingForTesting allow_blocking;
+    const std::string& resources,
+    uint8_t permission_mask) {
   auto source_provider = std::make_unique<brave_shields::TestFiltersProvider>(
-      dat_location, resources);
+      rules, resources, true, permission_mask);
 
   brave_shields::AdBlockService* ad_block_service =
       g_brave_browser_process->ad_block_service();
@@ -184,8 +165,8 @@ void AdBlockServiceTest::UpdateAdBlockInstanceWithDAT(
 void AdBlockServiceTest::UpdateCustomAdBlockInstanceWithRules(
     const std::string& rules,
     const std::string& resources) {
-  auto source_provider =
-      std::make_unique<brave_shields::TestFiltersProvider>(rules, resources);
+  auto source_provider = std::make_unique<brave_shields::TestFiltersProvider>(
+      rules, resources, false);
 
   brave_shields::AdBlockService* ad_block_service =
       g_brave_browser_process->ad_block_service();
@@ -226,18 +207,31 @@ void AdBlockServiceTest::GetTestDataDir(base::FilePath* test_data_dir) {
   base::PathService::Get(brave::DIR_TEST_DATA, test_data_dir);
 }
 
-bool AdBlockServiceTest::InstallDefaultAdBlockExtension(
-    const std::string& extension_dir) {
+bool AdBlockServiceTest::InstallDefaultAdBlockComponent(
+    const std::string& component_dir) {
   base::FilePath test_data_dir;
   GetTestDataDir(&test_data_dir);
-  const extensions::Extension* ad_block_extension = LoadExtensionAsComponent(
-      test_data_dir.AppendASCII("adblock-data").AppendASCII(extension_dir));
-  if (!ad_block_extension)
+  g_brave_browser_process->ad_block_service()
+      ->component_service_manager()
+      ->SetFilterListCatalog({brave_shields::FilterListCatalogEntry(
+          "default", "", "Brave Ad Block Updater", {}, "",
+          "Default lists for Brave Browser", true, true, true, 0,
+          kDefaultAdBlockComponentTestId,
+          kDefaultAdBlockComponentTest64PublicKey, "", "")});
+  const extensions::Extension* ad_block_component = LoadExtensionAsComponent(
+      test_data_dir.AppendASCII("adblock-data").AppendASCII(component_dir));
+  if (!ad_block_component) {
     return false;
+  }
+
+  auto& component_providers = g_brave_browser_process->ad_block_service()
+                                  ->component_service_manager()
+                                  ->regional_filters_providers();
+  EXPECT_EQ(component_providers.size(), 1UL);
+  auto& default_provider = component_providers.at("default");
+  EXPECT_TRUE(default_provider);
+  default_provider->OnComponentReady(ad_block_component->path());
 
-  g_brave_browser_process->ad_block_service()
-      ->default_filters_provider()
-      ->OnComponentReady(ad_block_extension->path());
   WaitForAdBlockServiceThreads();
 
   return true;
@@ -268,12 +262,11 @@ class EngineTestObserver : public brave_shields::AdBlockEngine::TestObserver {
   raw_ptr<brave_shields::AdBlockEngine> engine_ = nullptr;
 };
 
-bool AdBlockServiceTest::InstallRegionalAdBlockExtension(
+bool AdBlockServiceTest::InstallRegionalAdBlockComponent(
     const std::string& uuid,
     bool enable_list) {
-  // The regional adblock engines depend on the default engine for resource
-  // loads.
-  EXPECT_TRUE(InstallDefaultAdBlockExtension());
+  // Ensure the default engine is initialized first
+  EXPECT_TRUE(InstallDefaultAdBlockComponent());
   auto* default_engine =
       g_brave_browser_process->ad_block_service()->default_engine_.get();
   EngineTestObserver default_engine_observer(default_engine);
@@ -285,36 +278,38 @@ bool AdBlockServiceTest::InstallRegionalAdBlockExtension(
   filter_list_catalog.push_back(brave_shields::FilterListCatalogEntry(
       uuid, "https://easylist-downloads.adblockplus.org/liste_fr.txt",
       "EasyList Liste FR", {"fr"}, "https://forums.lanik.us/viewforum.php?f=91",
+      "Removes advertisements from French websites", false, false, false, 0,
       kRegionalAdBlockComponentTestId, kRegionalAdBlockComponentTest64PublicKey,
-      "Removes advertisements from French websites", "", ""));
+      "", ""));
   g_brave_browser_process->ad_block_service()
-      ->regional_service_manager()
+      ->component_service_manager()
       ->SetFilterListCatalog(filter_list_catalog);
 
   if (enable_list) {
-    const extensions::Extension* ad_block_extension =
+    const extensions::Extension* ad_block_component =
         LoadExtensionAsComponent(test_data_dir.AppendASCII("adblock-data")
                                      .AppendASCII("adblock-regional"));
-    if (!ad_block_extension)
+    if (!ad_block_component) {
       return false;
+    }
 
     g_brave_browser_process->ad_block_service()
-        ->regional_service_manager()
+        ->component_service_manager()
         ->EnableFilterList(uuid, true);
 
     const auto& regional_filters_providers =
         g_brave_browser_process->ad_block_service()
-            ->regional_service_manager()
+            ->component_service_manager()
             ->regional_filters_providers();
 
-    EXPECT_EQ(regional_filters_providers.size(), 1ULL);
+    EXPECT_EQ(regional_filters_providers.size(), 2ULL);
 
     auto* regional_engine = g_brave_browser_process->ad_block_service()
                                 ->additional_filters_engine_.get();
     EngineTestObserver regional_engine_observer(regional_engine);
     auto regional_filters_provider = regional_filters_providers.find(uuid);
     regional_filters_provider->second->OnComponentReady(
-        ad_block_extension->path());
+        ad_block_component->path());
     regional_engine_observer.Wait();
   }
 
@@ -351,7 +346,7 @@ void AdBlockServiceTest::DisableAggressiveMode() {
 
 // Load a page with an ad image, and make sure it is blocked.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByDefaultBlocker) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -369,7 +364,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByDefaultBlocker) {
 // blocked by custom filters.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        NotAdsDoNotGetBlockedByCustomBlocker) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateCustomAdBlockInstanceWithRules("*ad_banner.png");
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
@@ -388,7 +383,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 // Load a page with an ad image, and make sure it is blocked by custom
 // filters.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByCustomBlocker) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   UpdateAdBlockInstanceWithRules("");
@@ -409,7 +404,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByCustomBlocker) {
 // Load a page with an ad image, with a corresponding exception installed in
 // the custom filters, and make sure it is not blocked.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, DefaultBlockCustomException) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   UpdateAdBlockInstanceWithRules("*ad_banner.png");
@@ -429,7 +424,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, DefaultBlockCustomException) {
 // Load a page with an image blocked by custom filters, with a corresponding
 // exception installed in the default filters, and make sure it is not blocked.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CustomBlockDefaultException) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   UpdateAdBlockInstanceWithRules("@@ad_banner.png");
   UpdateCustomAdBlockInstanceWithRules("*ad_banner.png");
@@ -449,7 +444,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CustomBlockDefaultException) {
 // blocked.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        NotAdsDoNotGetBlockedByDefaultBlocker) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -463,15 +458,15 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 }
 
-// Load a page with an ad image, and make sure it is blocked by the
-// regional blocker.
+// Load a page with an ad image, and make sure it is blocked by a filter from a
+// regional list component.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByRegionalBlocker) {
   g_browser_process->SetApplicationLocale("fr");
   ASSERT_STREQ(g_browser_process->GetApplicationLocale().c_str(), "fr");
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
-  ASSERT_TRUE(InstallRegionalAdBlockExtension(kAdBlockEasyListFranceUUID));
+  ASSERT_TRUE(InstallRegionalAdBlockComponent(kAdBlockEasyListFranceUUID));
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
   ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), url));
@@ -485,7 +480,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdsGetBlockedByRegionalBlocker) {
 }
 
 // Load a page with an image which is not an ad, and make sure it is
-// NOT blocked by the regional blocker.
+// NOT blocked by a filter from a regional list.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        NotAdsDoNotGetBlockedByRegionalBlocker) {
   g_browser_process->SetApplicationLocale("fr");
@@ -493,7 +488,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
-  ASSERT_TRUE(InstallRegionalAdBlockExtension(kAdBlockEasyListFranceUUID));
+  ASSERT_TRUE(InstallRegionalAdBlockComponent(kAdBlockEasyListFranceUUID));
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
   ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), url));
@@ -509,7 +504,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 // Load a page with several of the same adblocked xhr requests, it should only
 // count 1.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, TwoSameAdsGetCountedAsOne) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -531,7 +526,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, TwoSameAdsGetCountedAsOne) {
 
 // Load a page with different adblocked xhr requests, it should count each.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, TwoDiffAdsGetCountedAsTwo) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -553,7 +548,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, TwoDiffAdsGetCountedAsTwo) {
 
 // New tab continues to count blocking the same resource
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, NewTabContinuesToBlock) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -579,7 +574,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, NewTabContinuesToBlock) {
 
 // XHRs and ads in a cross-site iframe are blocked as well.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubFrame) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL("a.com", "/iframe_blocking.html");
@@ -610,7 +605,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubFrame) {
 
 // Checks nothing is blocked if shields are off.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubFrameShieldsOff) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL url = embedded_test_server()->GetURL("a.com", "/iframe_blocking.html");
@@ -645,7 +640,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubFrameShieldsOff) {
 
 // Requests made by a service worker should be blocked as well.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ServiceWorkerRequest) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("adbanner.js");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
@@ -662,7 +657,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ServiceWorkerRequest) {
 }
 
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, WebSocketBlocking) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("*$websocket");
 
   ASSERT_TRUE(ws_server_.Start());
@@ -679,10 +674,10 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, WebSocketBlocking) {
                                              ws_url.spec().c_str())));
 }
 
-// Load a page with an ad image which is matched on the regional blocker,
-// but make sure it is saved by the default ad_block_client's exception.
-// This test is the same as AdsGetBlockedByRegionalBlocker except for at
-// the start it adds an exception rule to the non regional adblocker.
+// Load a page with an ad image which is matched by a filter in the additional
+// engine, but make sure it is saved by an exception in the default engine.
+// This test is the same as AdsGetBlockedByRegionalBlocker except for at the
+// start it adds an exception rule to the default engine.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        ExceptionAdsAreAllowedAcrossClients) {
   g_browser_process->SetApplicationLocale("fr");
@@ -690,7 +685,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
-  ASSERT_TRUE(InstallRegionalAdBlockExtension(kAdBlockEasyListFranceUUID));
+  ASSERT_TRUE(InstallRegionalAdBlockComponent(kAdBlockEasyListFranceUUID));
   UpdateAdBlockInstanceWithRules("*ad_fr*\n@@*ad_fr.png*");
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -705,7 +700,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 
 // Make sure the third-party flag is passed into the ad-block library properly
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdBlockThirdPartyWorksByETLDP1) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||a.com$third-party");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
@@ -725,7 +720,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, AdBlockThirdPartyWorksByETLDP1) {
 // Make sure the third-party flag is passed into the ad-block library properly
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        AdBlockThirdPartyWorksForThirdPartyHost) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||a.com$third-party");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL tab_url = embedded_test_server()->GetURL("b.com", kAdBlockTestPage);
@@ -791,7 +786,7 @@ class TestAdBlockSubscriptionServiceManagerObserver
 // The download in this test fails intermittently with a network error code,
 // although it doesn't seem to occur in real usage.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeToCustomSubscription) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL subscription_url =
       embedded_test_server()->GetURL("lists.com", "/list.txt");
@@ -901,7 +896,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeToCustomSubscription) {
 
 // Make sure the state of a list that cannot be fetched is as expected
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeTo404List) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL subscription_url =
       embedded_test_server()->GetURL("lists.com", "/this/list/does/not/exist");
@@ -946,7 +941,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeTo404List) {
 
 // Make sure that a list cannot be subscribed to twice
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeToListUrlTwice) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL subscription_url =
       embedded_test_server()->GetURL("lists.com", "/this/list/does/not/exist");
@@ -989,7 +984,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SubscribeToListUrlTwice) {
 // issue the correct number of DNS resolutions
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        MAYBE_CnameCloakedRequestsGetBlocked) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||cname-cloak-endpoint.tracking.com^");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL tab_url = embedded_test_server()->GetURL("a.com", kAdBlockTestPage);
@@ -1072,7 +1067,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 // to its CNAME-uncloaked equivalent.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        MAYBE_CnameCloakedRequestsCanBeExcepted) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "||cname-cloak-endpoint.tracking.com^\n"
       "@@a.com*/logo.png?unblock^");
@@ -1179,7 +1174,7 @@ class CnameUncloakingFlagDisabledTest : public AdBlockServiceTest {
 // Make sure that CNAME uncloaking does not occur when the CNAME uncloaking
 // flag is disabled.
 IN_PROC_BROWSER_TEST_F(CnameUncloakingFlagDisabledTest, NoDnsQueriesIssued) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||cname-cloak-endpoint.tracking.com^");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL tab_url = embedded_test_server()->GetURL("a.com", kAdBlockTestPage);
@@ -1258,7 +1253,7 @@ IN_PROC_BROWSER_TEST_F(CnameUncloakingFlagDisabledTest, NoDnsQueriesIssued) {
 
 // Load an image from a specific subdomain, and make sure it is blocked.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, BlockNYP) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||sp1.nypost.com$third-party");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL tab_url = embedded_test_server()->GetURL("b.com", kAdBlockTestPage);
@@ -1276,7 +1271,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, BlockNYP) {
 
 // Frame root URL is used for context rather than the tab URL
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, FrameSourceURL) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("adbanner.js$domain=a.com");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL url = embedded_test_server()->GetURL("a.com", "/iframe_blocking.html");
@@ -1301,7 +1296,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, FrameSourceURL) {
 
 // Tags for social buttons work
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SocialButttonAdBlockTagTest) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       base::StringPrintf("||example.com^$tag=%s",
                          brave_shields::kFacebookEmbeds)
@@ -1325,7 +1320,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SocialButttonAdBlockTagTest) {
 
 // Lack of tags for social buttons work
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SocialButttonAdBlockDiffTagTest) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("||example.com^$tag=sup");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   GURL tab_url = embedded_test_server()->GetURL("b.com", kAdBlockTestPage);
@@ -1346,7 +1341,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, SocialButttonAdBlockDiffTagTest) {
 
 // Tags are preserved after resetting
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ResetPreservesTags) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   g_brave_browser_process->ad_block_service()->EnableTag(
       brave_shields::kFacebookEmbeds, true);
   WaitForAdBlockServiceThreads();
@@ -1404,7 +1399,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, TagPrefsControlTags) {
 
 // Load a page with a blocked image, and make sure it is collapsed.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CollapseBlockedImage) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -1427,7 +1422,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CollapseBlockedImage) {
 
 // Load a page with a blocked iframe, and make sure it is collapsed.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CollapseBlockedIframe) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -1459,7 +1454,7 @@ class CollapseBlockedElementsFlagDisabledTest : public AdBlockServiceTest {
 // Load a page with a blocked image, and make sure it is not collapsed.
 IN_PROC_BROWSER_TEST_F(CollapseBlockedElementsFlagDisabledTest,
                        DontCollapseBlockedImage) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -1483,7 +1478,7 @@ IN_PROC_BROWSER_TEST_F(CollapseBlockedElementsFlagDisabledTest,
 // Load a page with a blocked iframe, and make sure it is not collapsed.
 IN_PROC_BROWSER_TEST_F(CollapseBlockedElementsFlagDisabledTest,
                        DontCollapseBlockedIframe) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   GURL url = embedded_test_server()->GetURL(kAdBlockTestPage);
@@ -1516,7 +1511,7 @@ class Default1pBlockingFlagDisabledTest : public AdBlockServiceTest {
 // match the same filter in the default engine. Ensure the third-party one is
 // blocked while the first-party one is allowed.
 IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, Default1pBlocking) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   UpdateAdBlockInstanceWithRules("^ad_banner.png");
@@ -1541,7 +1536,7 @@ IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, Default1pBlocking) {
 // match the same filter in the default engine. They should both be blocked on
 // special URLs like this one.
 IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, SpecialUrlException) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   UpdateAdBlockInstanceWithRules("^ad_banner.png");
@@ -1568,7 +1563,7 @@ IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, SpecialUrlException) {
 // ensure that both are blocked.
 IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest,
                        Aggressive1pBlocking) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   UpdateAdBlockInstanceWithRules("^ad_banner.png");
 
@@ -1592,7 +1587,7 @@ IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest,
 // match the same filter in the custom filters engine. Ensure that both are
 // blocked.
 IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, Custom1pBlocking) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
   UpdateCustomAdBlockInstanceWithRules("^ad_banner.png");
@@ -1616,7 +1611,7 @@ IN_PROC_BROWSER_TEST_F(Default1pBlockingFlagDisabledTest, Custom1pBlocking) {
 
 // Load a page with a script which uses a redirect data URL.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RedirectRulesAreRespected) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("js_mock_me.js$redirect=noopjs",
                                  R"(
       [
@@ -1651,18 +1646,8 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RedirectRulesAreRespected) {
 // A redirection should only be applied if there's also a matching blocking
 // rule.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RedirectWithoutBlockIsNoop) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
-  // The DAT for this test contains the following rules:
-  //   .js?block=true
-  //   js_mock_me.js$redirect-rule=noopjs
-  // At the time of this test's writing, `redirect-rule` parsing is currently
-  // not supported by the engine, but it should work correctly when the CRX
-  // packager eventually begins shipping DATs that include them.
-  base::FilePath test_data_dir;
-  GetTestDataDir(&test_data_dir);
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
 
-  base::FilePath dat_location = test_data_dir.AppendASCII("adblock-data")
-                                    .AppendASCII("redirect-rule.dat");
   std::string resources = R"([{
         "name": "noop.js",
         "aliases": ["noopjs"],
@@ -1671,7 +1656,10 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RedirectWithoutBlockIsNoop) {
         },
         "content": "KGZ1bmN0aW9uKCkgewogICAgJ3VzZSBzdHJpY3QnOwp9KSgpOwo="
       }])";
-  UpdateAdBlockInstanceWithDAT(dat_location, resources);
+  UpdateAdBlockInstanceWithRules(
+      ".js?block=true\n"
+      "js_mock_me.js$redirect-rule=noopjs",
+      resources);
 
   WaitForAdBlockServiceThreads();
 
@@ -1727,7 +1715,7 @@ std::unique_ptr<net::test_server::HttpResponse> NoParamHandler(
 
 // `$removeparam` should be respected for subresource requests
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RemoveparamSubresource) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   UpdateAdBlockInstanceWithRules("*$subdocument,removeparam=evil");
@@ -1760,7 +1748,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RemoveparamSubresource) {
 
 // `$removeparam` should be respected for top-level navigations
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RemoveparamTopLevelNavigation) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 
   UpdateAdBlockInstanceWithRules("*$document,removeparam=evil");
@@ -1783,7 +1771,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, RemoveparamTopLevelNavigation) {
 
 // `$removeparam` should not be activated in default blocking mode
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, DefaultNoRemoveparam) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
 
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
@@ -1810,7 +1798,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, DefaultNoRemoveparam) {
 // Verify that scripts violating a Content Security Policy from a `$csp` rule
 // are not loaded.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CspRule) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "||example.com^$csp=script-src 'nonce-abcdef' 'unsafe-eval' 'self'");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
@@ -1839,7 +1827,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CspRule) {
 // The policy resulting from two of the same kind of directive will be the
 // union of both.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CspRuleMerging) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "||example.com^$csp=script-src 'nonce-abcdef' 'unsafe-eval' 'self'");
   UpdateCustomAdBlockInstanceWithRules(
@@ -1866,10 +1854,32 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CspRuleMerging) {
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
 }
 
+// Lists with `hidden` set to `true` should not be shown in `GetRegionalLists`.
+IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, HiddenListsNotPresented) {
+  std::vector<brave_shields::FilterListCatalogEntry> filter_list_catalog;
+  filter_list_catalog.push_back(brave_shields::FilterListCatalogEntry(
+      "uuid1", "https://example.com", "Hidden list", {},
+      "https://support.example.com", "first list", true, false, false, 0,
+      "testid1", "pubkey1", "", ""));
+  filter_list_catalog.push_back(brave_shields::FilterListCatalogEntry(
+      "uuid2", "https://example.com", "Normal list", {},
+      "https://support.example.com", "second list", false, false, false, 0,
+      "testid2", "pubkey2", "", ""));
+  g_brave_browser_process->ad_block_service()
+      ->component_service_manager()
+      ->SetFilterListCatalog(filter_list_catalog);
+
+  auto regional_lists = g_brave_browser_process->ad_block_service()
+                            ->component_service_manager()
+                            ->GetRegionalLists();
+
+  ASSERT_EQ(regional_lists.size(), 1UL);
+}
+
 // Verify that scripts violating a Content Security Policy from a `$csp` rule
 // are not loaded.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CspRuleShieldsDown) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "||example.com^$csp=script-src 'nonce-abcdef' 'unsafe-eval' 'self'");
   EXPECT_EQ(browser()->profile()->GetPrefs()->GetUint64(kAdsBlocked), 0ULL);
@@ -1906,7 +1916,7 @@ class CosmeticFilteringFlagDisabledTest : public AdBlockServiceTest {
 // Ensure no cosmetic filtering occurs when the feature flag is disabled
 IN_PROC_BROWSER_TEST_F(CosmeticFilteringFlagDisabledTest,
                        CosmeticFilteringSimple) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "b.com###ad-banner\n"
       "##.ad");
@@ -1951,7 +1961,7 @@ class CosmeticFilteringPlaylistFlagEnabledTest : public AdBlockServiceTest {
 // background web contents.
 IN_PROC_BROWSER_TEST_F(CosmeticFilteringPlaylistFlagEnabledTest,
                        AllowCosmeticFiltering) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   const GURL url =
       embedded_test_server()->GetURL("b.com", "/cosmetic_filtering.html");
 
@@ -1975,7 +1985,7 @@ IN_PROC_BROWSER_TEST_F(CosmeticFilteringPlaylistFlagEnabledTest,
 
 // Ensure no cosmetic filtering occurs when the shields setting is disabled
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDisabled) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   brave_shields::SetCosmeticFilteringControlType(
       content_settings(), brave_shields::ControlType::ALLOW, GURL());
   UpdateAdBlockInstanceWithRules(
@@ -2000,7 +2010,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDisabled) {
 
 // Test simple cosmetic filtering
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringSimple) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "b.com###ad-banner\n"
       "##.ad");
@@ -2031,7 +2041,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringSimple) {
 // Test that cosmetic filtering is applied independently in a third-party child
 // frame
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringFrames) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("frame.com##.ad\n");
 
   GURL tab_url =
@@ -2068,7 +2078,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringFrames) {
 // blocking mode
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        CosmeticFilteringHasPseudoclassStandard) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
   UpdateAdBlockInstanceWithRules("b.com##.container:has(#promotion)\n");
 
@@ -2087,7 +2097,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 // aggressive blocking mode
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        CosmeticFilteringHasPseudoclassAggressive) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("b.com##.container:has(#promotion)\n");
 
   GURL tab_url =
@@ -2117,7 +2127,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 
 // Test cosmetic filtering ignores content determined to be 1st party
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringProtect1p) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   DisableAggressiveMode();
   UpdateAdBlockInstanceWithRules(
       "appspot.com##.fpsponsored\n"
@@ -2156,7 +2166,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringProtect1p) {
 
 // Test cosmetic filtering bypasses 1st party checks in Aggressive mode
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringHide1pContent) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("b.com##.fpsponsored\n");
 
   GURL tab_url =
@@ -2174,7 +2184,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringHide1pContent) {
 
 // Test cosmetic filtering on elements added dynamically
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDynamic) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("##.blockme\n##.hide-innerhtml");
 
   GURL tab_url =
@@ -2206,7 +2216,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDynamic) {
 // Test cosmetic filtering on elements added dynamically, using a rule from the
 // custom filters
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDynamicCustom) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   ASSERT_TRUE(g_brave_browser_process->ad_block_service()
                   ->custom_filters_provider()
                   ->UpdateCustomFilters("##.blockme"));
@@ -2234,7 +2244,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringDynamicCustom) {
 // `generichide` exception rule, both for elements added dynamically and
 // elements present at page load
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringGenerichide) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "##.blockme\n"
       "##img[src=\"https://example.com/logo.png\"]\n"
@@ -2259,7 +2269,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringGenerichide) {
 
 // Test custom style rules
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringCustomStyle) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("b.com##.ad:style(padding-bottom: 10px)");
 
   GURL tab_url =
@@ -2277,7 +2287,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringCustomStyle) {
 
 // Test rules overridden by hostname-specific exception rules
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringUnhide) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "##.ad\n"
       "b.com#@#.ad\n"
@@ -2304,7 +2314,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringUnhide) {
 
 // Test scriptlet injection that modifies window attributes
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringWindowScriptlet) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   std::string scriptlet =
       "(function() {"
       "  const send = window.getComputedStyle;"
@@ -2336,6 +2346,64 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringWindowScriptlet) {
   EXPECT_EQ(base::Value(true), result.value);
 }
 
+// Test that permissioned scriptlets can only be injected from appropriately
+// permissioned lists
+IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ScriptletInjectionPermissions) {
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
+  std::string scriptlet =
+      "(function() {"
+      "  window.success = true;"
+      "})();";
+  std::string scriptlet_base64;
+  base::Base64Encode(scriptlet, &scriptlet_base64);
+  std::string resources =
+      "[{"
+      "\"name\": \"set-success.js\","
+      "\"aliases\": [],"
+      "\"kind\": {\"mime\": \"application/javascript\"},"
+      "\"permission\": 3,"  // i.e. 0b00000011
+      "\"content\": \"" +
+      scriptlet_base64 + "\"}]";
+  std::string rules = "b.com##+js(set-success)";
+
+  GURL tab_url =
+      embedded_test_server()->GetURL("b.com", "/cosmetic_filtering.html");
+  content::WebContents* contents;
+
+  // Add the list with default (i.e. no) permissions
+  UpdateAdBlockInstanceWithRules(rules, resources);
+
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), tab_url));
+  contents = browser()->tab_strip_model()->GetActiveWebContents();
+
+  {
+    auto result = EvalJs(contents, R"(window.success === undefined)");
+    EXPECT_EQ(base::Value(true), result.value);
+  }
+
+  // Add a list with different but still insufficient permissions
+  UpdateAdBlockInstanceWithRules(rules, resources, 5);
+
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), tab_url));
+  contents = browser()->tab_strip_model()->GetActiveWebContents();
+
+  {
+    auto result = EvalJs(contents, R"(window.success === undefined)");
+    EXPECT_EQ(base::Value(true), result.value);
+  }
+
+  // Finally add a list with sufficient permissions
+  UpdateAdBlockInstanceWithRules(rules, resources, 7);
+
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), tab_url));
+  contents = browser()->tab_strip_model()->GetActiveWebContents();
+
+  {
+    auto result = EvalJs(contents, R"(window.success)");
+    EXPECT_EQ(base::Value(true), result.value);
+  }
+}
+
 class ScriptletDebugLogsFlagEnabledTest : public AdBlockServiceTest {
  public:
   ScriptletDebugLogsFlagEnabledTest() {
@@ -2349,7 +2417,7 @@ class ScriptletDebugLogsFlagEnabledTest : public AdBlockServiceTest {
 // Test that scriptlet injection has access to `canDebug` inside of
 // `scriptletGlobals`, and that it is set to `true`.
 IN_PROC_BROWSER_TEST_F(ScriptletDebugLogsFlagEnabledTest, CanDebugSetToTrue) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   std::string scriptlet =
       "(function() {"
       "  if (scriptletGlobals.get('canDebug')) {"
@@ -2424,7 +2492,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CheckForDeAmpPref) {
 
 // Test scriptlet injection that modifies window attributes
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringIframeScriptlet) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   std::string scriptlet =
       "(function() {"
       "  window.JSON.parse = function() { return {} }"
@@ -2454,7 +2522,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, CosmeticFilteringIframeScriptlet) {
 // marker on its `display` style.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        DISABLED_CosmeticFilteringOverridesImportant) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("###inline-block-important");
 
   GURL tab_url =
@@ -2476,7 +2544,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
 // exception policy.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest,
                        CustomCosmeticFilteringOverridesImportant) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateCustomAdBlockInstanceWithRules("###inline-block-important");
 
   GURL tab_url =
@@ -2521,11 +2589,11 @@ class CookieListPrefObserver {
 // List UUID to be enabled, until manually enabled and then disabled again.
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ListEnabled) {
   ASSERT_TRUE(
-      InstallRegionalAdBlockExtension(brave_shields::kCookieListUuid, false));
+      InstallRegionalAdBlockComponent(brave_shields::kCookieListUuid, false));
 
   {
     const auto lists = g_brave_browser_process->ad_block_service()
-                           ->regional_service_manager()
+                           ->component_service_manager()
                            ->GetRegionalLists();
     // Although never explicitly enabled, it should be presented as enabled by
     // default at first.
@@ -2537,14 +2605,14 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTest, ListEnabled) {
   {
     CookieListPrefObserver pref_observer(g_browser_process->local_state());
     g_brave_browser_process->ad_block_service()
-        ->regional_service_manager()
+        ->component_service_manager()
         ->EnableFilterList(brave_shields::kCookieListUuid, false);
     pref_observer.Wait();
   }
 
   {
     const auto lists = g_brave_browser_process->ad_block_service()
-                           ->regional_service_manager()
+                           ->component_service_manager()
                            ->GetRegionalLists();
     // It should be actually disabled now.
     ASSERT_EQ(1UL, lists.size());
@@ -2597,7 +2665,7 @@ class AdBlockServiceTestJsPerformance : public AdBlockServiceTest {
 
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTestJsPerformance,
                        CosmeticFilteringDynamic) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules(
       "##.div-class-100\n##.div-class-500\n##.div-class-1000");
 
@@ -2641,7 +2709,7 @@ IN_PROC_BROWSER_TEST_F(AdBlockServiceTestJsPerformance,
 
 IN_PROC_BROWSER_TEST_F(AdBlockServiceTestJsPerformance,
                        CosmeticFilteringSubframeDynamic) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   UpdateAdBlockInstanceWithRules("##.div-class-500");
 
   GURL tab_url =
diff --git a/browser/brave_shields/ad_block_service_browsertest.h b/browser/brave_shields/ad_block_service_browsertest.h
index 36e68f7cbbd9..5dc5182f7610 100644
--- a/browser/brave_shields/ad_block_service_browsertest.h
+++ b/browser/brave_shields/ad_block_service_browsertest.h
@@ -40,7 +40,8 @@ class AdBlockServiceTest : public extensions::ExtensionBrowserTest {
 
   HostContentSettingsMap* content_settings();
   void UpdateAdBlockInstanceWithRules(const std::string& rules,
-                                      const std::string& resources = "[]");
+                                      const std::string& resources = "[]",
+                                      uint8_t permission_mask = 0);
   void UpdateAdBlockInstanceWithDAT(const base::FilePath& dat_location,
                                     const std::string& resources = "[]");
   void UpdateCustomAdBlockInstanceWithRules(
@@ -51,9 +52,9 @@ class AdBlockServiceTest : public extensions::ExtensionBrowserTest {
   void GetTestDataDir(base::FilePath* test_data_dir);
   void SetDefaultComponentIdAndBase64PublicKeyForTest();
   void SetRegionalComponentIdAndBase64PublicKeyForTest();
-  bool InstallDefaultAdBlockExtension(
+  bool InstallDefaultAdBlockComponent(
       const std::string& extension_dir = "adblock-default");
-  bool InstallRegionalAdBlockExtension(const std::string& uuid,
+  bool InstallRegionalAdBlockComponent(const std::string& uuid,
                                        bool enable_list = true);
   void SetSubscriptionIntervals();
   void WaitForAdBlockServiceThreads();
diff --git a/browser/brave_shields/domain_block_page_browsertest.cc b/browser/brave_shields/domain_block_page_browsertest.cc
index 7720e299d14a..017f9b52ba5b 100644
--- a/browser/brave_shields/domain_block_page_browsertest.cc
+++ b/browser/brave_shields/domain_block_page_browsertest.cc
@@ -105,7 +105,7 @@ class DomainBlockDisabledTest : public DomainBlockTestBase {
 };
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitial) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -121,7 +121,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitial) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndProceed) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -145,7 +145,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndProceed) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndReload) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -166,7 +166,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndReload) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedAndReload) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -199,7 +199,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedAndReload) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedDoesNotAffectNewTabs) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -233,7 +233,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedDoesNotAffectNewTabs) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, DontWarnAgainAndProceed) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -274,7 +274,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, DontWarnAgainAndProceed) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndGoBack) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url_a = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK,
                                   url_a);
@@ -300,7 +300,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ShowInterstitialAndGoBack) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoFetch) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   ASSERT_EQ(0, request_count_);
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
@@ -319,7 +319,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoFetch) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoThirdPartyInterstitial) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   ASSERT_TRUE(g_brave_browser_process->ad_block_service()
                   ->custom_filters_provider()
                   ->UpdateCustomFilters("||b.com^$third-party"));
@@ -354,7 +354,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoThirdPartyInterstitial) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoInterstitialUnlessAggressive) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -387,7 +387,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, NoInterstitialUnlessAggressive) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockDisabledTest, NoInterstitial) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK, url);
 
@@ -409,7 +409,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockDisabledTest, NoInterstitial) {
 }
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedDoesNotAffectOtherDomains) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url_a = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK,
                                   url_a);
@@ -450,7 +450,7 @@ IN_PROC_BROWSER_TEST_F(DomainBlockTest, ProceedDoesNotAffectOtherDomains) {
 
 IN_PROC_BROWSER_TEST_F(DomainBlockTest,
                        DontWarnAgainDoesNotAffectOtherDomains) {
-  ASSERT_TRUE(InstallDefaultAdBlockExtension());
+  ASSERT_TRUE(InstallDefaultAdBlockComponent());
   GURL url_a = embedded_test_server()->GetURL("a.com", "/simple.html");
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK,
                                   url_a);
diff --git a/browser/debounce/debounce_browsertest.cc b/browser/debounce/debounce_browsertest.cc
index 919594d8bfc3..ae3219fdda7f 100644
--- a/browser/debounce/debounce_browsertest.cc
+++ b/browser/debounce/debounce_browsertest.cc
@@ -5,7 +5,6 @@
 
 #include "base/base64url.h"
 #include "base/memory/raw_ptr.h"
-#include "base/path_service.h"
 #include "base/scoped_observation.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/scoped_feature_list.h"
@@ -13,11 +12,9 @@
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/brave_content_browser_client.h"
 #include "brave/browser/extensions/brave_base_local_data_files_browsertest.h"
-#include "brave/components/brave_shields/browser/ad_block_component_filters_provider.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/brave_shields_util.h"
 #include "brave/components/brave_shields/browser/test_filters_provider.h"
-#include "brave/components/constants/brave_paths.h"
 #include "brave/components/debounce/browser/debounce_component_installer.h"
 #include "brave/components/debounce/common/features.h"
 #include "brave/components/debounce/common/pref_names.h"
@@ -25,15 +22,12 @@
 #include "chrome/browser/interstitials/security_interstitial_page_test_utils.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
-#include "components/network_session_configurator/common/network_switches.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/common/content_client.h"
 #include "content/public/test/browser_test.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
 #include "net/base/url_util.h"
-#include "net/dns/mock_host_resolver.h"
-#include "net/test/embedded_test_server/default_handlers.h"
 #include "third_party/blink/public/common/loader/url_loader_throttle.h"
 
 namespace {
@@ -181,19 +175,7 @@ class DebounceBrowserTest : public BaseLocalDataFilesBrowserTest {
     EXPECT_EQ(web_contents()->GetLastCommittedURL(), landing_url);
   }
 
-  bool InstallAdBlockForDebounce() {
-    base::FilePath test_data_dir;
-    GetTestDataDir(&test_data_dir);
-    const extensions::Extension* ad_block_extension =
-        InstallExtension(test_data_dir.AppendASCII("adblock-data")
-                             .AppendASCII("adblock-default"),
-                         1);
-    if (!ad_block_extension) {
-      return false;
-    }
-    g_brave_browser_process->ad_block_service()
-        ->default_filters_provider()
-        ->OnComponentReady(ad_block_extension->path());
+  bool InitAdBlockForDebounce() {
     auto source_provider = std::make_unique<brave_shields::TestFiltersProvider>(
         "||blocked.com^", "[]");
     g_brave_browser_process->ad_block_service()->UseSourceProvidersForTest(
@@ -439,7 +421,7 @@ IN_PROC_BROWSER_TEST_F(DebounceBrowserTest, DebounceBeforeDomainBlock) {
   // Install adblock, turn on aggressive blocking for this URL, then attempt to
   // navigate to it. This should be interrupted by the domain block
   // interstitial.
-  ASSERT_TRUE(InstallAdBlockForDebounce());
+  ASSERT_TRUE(InitAdBlockForDebounce());
   SetCosmeticFilteringControlType(content_settings(), ControlType::BLOCK,
                                   original_url);
   NavigateTo(original_url);
diff --git a/browser/perf/brave_perf_features_processor.cc b/browser/perf/brave_perf_features_processor.cc
index 03d5d94adce7..79c67cac9434 100644
--- a/browser/perf/brave_perf_features_processor.cc
+++ b/browser/perf/brave_perf_features_processor.cc
@@ -13,7 +13,7 @@
 #include "brave/components/brave_ads/core/public/prefs/pref_names.h"
 #include "brave/components/brave_news/common/pref_names.h"
 #include "brave/components/brave_rewards/browser/rewards_service.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 #include "chrome/browser/profiles/profile.h"
@@ -33,10 +33,10 @@ void EnableAdblockCookieList(base::WeakPtr<Profile> profile) {
   }
 
   // Obtrusive cookie notices list in cosmetic filters.
-  auto* regional_service_manager =
-      g_brave_browser_process->ad_block_service()->regional_service_manager();
-  if (!regional_service_manager ||
-      !regional_service_manager->IsFilterListAvailable(
+  auto* component_service_manager =
+      g_brave_browser_process->ad_block_service()->component_service_manager();
+  if (!component_service_manager ||
+      !component_service_manager->IsFilterListAvailable(
           brave_shields::kCookieListUuid)) {
     base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
         FROM_HERE, base::BindOnce(&EnableAdblockCookieList, profile),
@@ -44,8 +44,8 @@ void EnableAdblockCookieList(base::WeakPtr<Profile> profile) {
     return;
   }
 
-  regional_service_manager->EnableFilterList(brave_shields::kCookieListUuid,
-                                             true);
+  component_service_manager->EnableFilterList(brave_shields::kCookieListUuid,
+                                              true);
 }
 
 }  // namespace
diff --git a/browser/ui/views/brave_shields/cookie_list_opt_in_browsertest.cc b/browser/ui/views/brave_shields/cookie_list_opt_in_browsertest.cc
index beb6d10829e8..9cb66968b13c 100644
--- a/browser/ui/views/brave_shields/cookie_list_opt_in_browsertest.cc
+++ b/browser/ui/views/brave_shields/cookie_list_opt_in_browsertest.cc
@@ -11,7 +11,7 @@
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/perf/brave_perf_switches.h"
 #include "brave/browser/ui/views/brave_shields/cookie_list_opt_in_bubble_host.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/filter_list_catalog_entry.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
@@ -38,13 +38,13 @@ namespace brave_shields {
 
 namespace {
 
-auto* GetRegionalServiceManager() {
+auto* GetComponentServiceManager() {
   return g_brave_browser_process->ad_block_service()
-      ->regional_service_manager();
+      ->component_service_manager();
 }
 
 bool IsCookieListFilterEnabled() {
-  return GetRegionalServiceManager()->IsFilterListEnabled(kCookieListUuid);
+  return GetComponentServiceManager()->IsFilterListEnabled(kCookieListUuid);
 }
 
 class CookieListFilterEnabledObserver {
@@ -127,10 +127,10 @@ class CookieListOptInBrowserTest : public InProcessBrowserTest {
         kCookieListUuid,
         "https://secure.fanboy.co.nz/fanboy-cookiemonster_ubo.txt",
         "Easylist-Cookie List - Filter Obtrusive Cookie Notices", {},
-        "https://forums.lanik.us/", kRegionalAdBlockComponentTestId,
-        kRegionalAdBlockComponentTest64PublicKey,
-        "Removes obtrusive cookie law notices", "", "")};
-    GetRegionalServiceManager()->SetFilterListCatalog(filter_list_catalog);
+        "https://forums.lanik.us/", "Removes obtrusive cookie law notices",
+        false, false, false, 0, kRegionalAdBlockComponentTestId,
+        kRegionalAdBlockComponentTest64PublicKey, "", "")};
+    GetComponentServiceManager()->SetFilterListCatalog(filter_list_catalog);
   }
 
   base::test::ScopedFeatureList scoped_feature_list_;
@@ -248,7 +248,7 @@ class CookieListOptInPreEnabledBrowserTest : public CookieListOptInBrowserTest {
   void SetUpLocalState() override {
     CookieListOptInBrowserTest::SetUpLocalState();
 
-    GetRegionalServiceManager()->EnableFilterList(kCookieListUuid, true);
+    GetComponentServiceManager()->EnableFilterList(kCookieListUuid, true);
 
     // Since `AdBlockRegionalServiceManager::EnableFilterList` modifies local
     // state asynchronously in a posted task, waiting for the update to complete
diff --git a/browser/ui/views/brave_shields/cookie_list_opt_in_bubble_host.cc b/browser/ui/views/brave_shields/cookie_list_opt_in_bubble_host.cc
index d11fd753deb5..8d11107eb090 100644
--- a/browser/ui/views/brave_shields/cookie_list_opt_in_bubble_host.cc
+++ b/browser/ui/views/brave_shields/cookie_list_opt_in_bubble_host.cc
@@ -11,7 +11,7 @@
 #include "base/metrics/histogram_functions.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/ui/webui/brave_shields/cookie_list_opt_in_ui.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 #include "brave/components/brave_shields/common/features.h"
@@ -61,10 +61,10 @@ bool ShouldEventuallyShowBubble() {
 
   base::UmaHistogramExactLinear(kCookieListPromptHistogram, 0, 4);
 
-  auto* regional_service_manager =
-      g_brave_browser_process->ad_block_service()->regional_service_manager();
-  DCHECK(regional_service_manager);
-  if (regional_service_manager->IsFilterListEnabled(kCookieListUuid)) {
+  auto* component_service_manager =
+      g_brave_browser_process->ad_block_service()->component_service_manager();
+  DCHECK(component_service_manager);
+  if (component_service_manager->IsFilterListEnabled(kCookieListUuid)) {
     return false;
   }
 
@@ -146,11 +146,11 @@ void CookieListOptInBubbleHost::ShowBubble() {
   }
 
   // Do not show the bubble if the filter list is not yet available, likely
-  // because the regional filter list has not yet been donwloaded.
-  auto* regional_service_manager =
-      g_brave_browser_process->ad_block_service()->regional_service_manager();
-  DCHECK(regional_service_manager);
-  if (!regional_service_manager->IsFilterListAvailable(kCookieListUuid)) {
+  // because the filter list component has not yet been donwloaded.
+  auto* component_service_manager =
+      g_brave_browser_process->ad_block_service()->component_service_manager();
+  DCHECK(component_service_manager);
+  if (!component_service_manager->IsFilterListAvailable(kCookieListUuid)) {
     return;
   }
 
diff --git a/browser/ui/webui/brave_adblock_ui.cc b/browser/ui/webui/brave_adblock_ui.cc
index 43e1f3788e8a..9926f719b3a2 100644
--- a/browser/ui/webui/brave_adblock_ui.cc
+++ b/browser/ui/webui/brave_adblock_ui.cc
@@ -13,8 +13,8 @@
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/ui/webui/brave_webui_source.h"
 #include "brave/components/brave_adblock/resources/grit/brave_adblock_generated_map.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_custom_filters_provider.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/ad_block_service_helper.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
@@ -144,7 +144,7 @@ void AdblockDOMHandler::HandleEnableFilterList(const base::Value::List& args) {
   std::string uuid = args[0].GetString();
   bool enabled = args[1].GetBool();
   g_brave_browser_process->ad_block_service()
-      ->regional_service_manager()
+      ->component_service_manager()
       ->EnableFilterList(uuid, enabled);
 }
 
@@ -162,7 +162,7 @@ void AdblockDOMHandler::HandleGetRegionalLists(const base::Value::List& args) {
   DCHECK_EQ(args.size(), 0U);
   AllowJavascript();
   auto regional_lists = g_brave_browser_process->ad_block_service()
-                            ->regional_service_manager()
+                            ->component_service_manager()
                             ->GetRegionalLists();
   CallJavascriptFunction("brave_adblock.onGetRegionalLists", regional_lists);
 }
diff --git a/browser/ui/webui/brave_shields/cookie_list_opt_in_page_handler.cc b/browser/ui/webui/brave_shields/cookie_list_opt_in_page_handler.cc
index f1a95d870aab..feb3cf5e7f35 100644
--- a/browser/ui/webui/brave_shields/cookie_list_opt_in_page_handler.cc
+++ b/browser/ui/webui/brave_shields/cookie_list_opt_in_page_handler.cc
@@ -9,7 +9,7 @@
 
 #include "base/metrics/histogram_functions.h"
 #include "brave/browser/brave_browser_process.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 
@@ -43,7 +43,7 @@ void CookieListOptInPageHandler::CloseUI() {
 
 void CookieListOptInPageHandler::EnableFilter() {
   g_brave_browser_process->ad_block_service()
-      ->regional_service_manager()
+      ->component_service_manager()
       ->EnableFilterList(brave_shields::kCookieListUuid, true);
 }
 
diff --git a/browser/ui/webui/settings/brave_adblock_handler.cc b/browser/ui/webui/settings/brave_adblock_handler.cc
index 339991706f50..51878f5bfd97 100644
--- a/browser/ui/webui/settings/brave_adblock_handler.cc
+++ b/browser/ui/webui/settings/brave_adblock_handler.cc
@@ -14,8 +14,8 @@
 #include "base/values.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/components/brave_adblock/resources/grit/brave_adblock_generated_map.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_custom_filters_provider.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ -103,7 +103,7 @@ void BraveAdBlockHandler::OnServiceUpdateEvent() {
 void BraveAdBlockHandler::GetRegionalLists(const base::Value::List& args) {
   AllowJavascript();
   auto regional_lists = g_brave_browser_process->ad_block_service()
-                            ->regional_service_manager()
+                            ->component_service_manager()
                             ->GetRegionalLists();
 
   ResolveJavascriptCallback(args[0], regional_lists);
@@ -119,7 +119,7 @@ void BraveAdBlockHandler::EnableFilterList(const base::Value::List& args) {
   bool enabled = args[1].GetBool();
 
   g_brave_browser_process->ad_block_service()
-      ->regional_service_manager()
+      ->component_service_manager()
       ->EnableFilterList(uuid, enabled);
 }
 
diff --git a/components/brave_shields/adblock/rs/BUILD.gn b/components/brave_shields/adblock/rs/BUILD.gn
index 5e6a290cede7..bdf5b381707f 100644
--- a/components/brave_shields/adblock/rs/BUILD.gn
+++ b/components/brave_shields/adblock/rs/BUILD.gn
@@ -13,6 +13,7 @@ rust_static_library("rust_lib") {
   sources = [
     "src/convert.rs",
     "src/engine.rs",
+    "src/filter_set.rs",
     "src/lib.rs",
     "src/result.rs",
   ]
diff --git a/components/brave_shields/adblock/rs/src/engine.rs b/components/brave_shields/adblock/rs/src/engine.rs
index feffb5e187d3..a74da5e1fb5d 100644
--- a/components/brave_shields/adblock/rs/src/engine.rs
+++ b/components/brave_shields/adblock/rs/src/engine.rs
@@ -6,17 +6,17 @@
 use std::collections::HashSet;
 use std::str::Utf8Error;
 
-use adblock::Engine as InnerEngine;
-use adblock::lists::FilterSet;
+use adblock::lists::FilterSet as InnerFilterSet;
 use adblock::resources::{MimeType, Resource, ResourceType};
 use adblock::url_parser::ResolvesDomain;
+use adblock::Engine as InnerEngine;
 use cxx::{let_cxx_string, CxxString, CxxVector};
 
 use crate::ffi::{
     resolve_domain_position, BlockerResult, BoxEngineResult, ContentBlockingRulesResult,
-    FilterListMetadata, RegexDebugInfo, RegexManagerDiscardPolicy, UnitResult,
-    VecStringResult,
+    FilterListMetadata, RegexDebugInfo, RegexManagerDiscardPolicy, UnitResult, VecStringResult,
 };
+use crate::filter_set::FilterSet;
 use crate::result::InternalError;
 
 #[cfg(feature = "ios")]
@@ -38,7 +38,7 @@ pub fn new_engine() -> Box<Engine> {
 
 pub fn engine_with_rules(rules: &CxxVector<u8>) -> BoxEngineResult {
     || -> Result<Box<Engine>, InternalError> {
-        let mut filter_set = FilterSet::new(false);
+        let mut filter_set = InnerFilterSet::new(false);
         filter_set.add_filter_list(std::str::from_utf8(rules.as_slice())?, Default::default());
         let engine = InnerEngine::from_filter_set(filter_set, true);
         Ok(Box::new(Engine { engine }))
@@ -46,6 +46,15 @@ pub fn engine_with_rules(rules: &CxxVector<u8>) -> BoxEngineResult {
     .into()
 }
 
+/// Creates a new engine with rules from a given filter set.
+pub fn engine_from_filter_set(filter_set: Box<FilterSet>) -> BoxEngineResult {
+    || -> Result<Box<Engine>, InternalError> {
+        let engine = InnerEngine::from_filter_set(filter_set.0, true);
+        Ok(Box::new(Engine { engine }))
+    }()
+    .into()
+}
+
 struct DomainResolver;
 
 impl ResolvesDomain for DomainResolver {
@@ -75,7 +84,7 @@ pub fn convert_rules_to_content_blocking(rules: &CxxString) -> ContentBlockingRu
         /// https://github.com/WebKit/WebKit/blob/4a2df13be2253f64d8da58b794d74347a3742652/Source/WebCore/contentextensions/ContentExtensionParser.cpp#L299
         const MAX_CB_LIST_SIZE: usize = 150000;
 
-        let mut filter_set = FilterSet::new(true);
+        let mut filter_set = InnerFilterSet::new(true);
         filter_set.add_filter_list(
             rules.to_str()?,
             ParseOptions { rule_types: RuleTypes::NetworkOnly, ..Default::default() },
diff --git a/components/brave_shields/adblock/rs/src/filter_set.rs b/components/brave_shields/adblock/rs/src/filter_set.rs
new file mode 100644
index 000000000000..0310396ae710
--- /dev/null
+++ b/components/brave_shields/adblock/rs/src/filter_set.rs
@@ -0,0 +1,48 @@
+/* Copyright (c) 2023 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use adblock::{lists::ParseOptions, resources::PermissionMask, FilterSet as InnerFilterSet};
+use cxx::CxxVector;
+
+use crate::ffi::{FilterListMetadata, FilterListMetadataResult};
+use crate::result::InternalError;
+
+pub struct FilterSet(pub(crate) InnerFilterSet);
+
+impl Default for Box<FilterSet> {
+    fn default() -> Self {
+        new_filter_set()
+    }
+}
+
+pub fn new_filter_set() -> Box<FilterSet> {
+    Box::new(FilterSet(InnerFilterSet::new(false)))
+}
+
+impl FilterSet {
+    pub fn add_filter_list(&mut self, rules: &CxxVector<u8>) -> FilterListMetadataResult {
+        self.add_filter_list_with_permissions(rules, 0)
+    }
+
+    pub fn add_filter_list_with_permissions(
+        &mut self,
+        rules: &CxxVector<u8>,
+        permission_mask: u8,
+    ) -> FilterListMetadataResult {
+        || -> Result<FilterListMetadata, InternalError> {
+            Ok(self
+                .0
+                .add_filter_list(
+                    std::str::from_utf8(rules.as_slice())?,
+                    ParseOptions {
+                        permissions: PermissionMask::from_bits(permission_mask),
+                        ..Default::default()
+                    },
+                )
+                .into())
+        }()
+        .into()
+    }
+}
diff --git a/components/brave_shields/adblock/rs/src/lib.rs b/components/brave_shields/adblock/rs/src/lib.rs
index f1d6d3609422..77cac6778a72 100644
--- a/components/brave_shields/adblock/rs/src/lib.rs
+++ b/components/brave_shields/adblock/rs/src/lib.rs
@@ -8,19 +8,33 @@
 
 mod convert;
 mod engine;
+mod filter_set;
 mod result;
 
 use engine::*;
+use filter_set::*;
 
 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = adblock)]
 mod ffi {
+    extern "Rust" {
+        type FilterSet;
+        fn new_filter_set() -> Box<FilterSet>;
+        fn add_filter_list(&mut self, rules: &CxxVector<u8>) -> FilterListMetadataResult;
+        fn add_filter_list_with_permissions(
+            &mut self,
+            rules: &CxxVector<u8>,
+            permission_mask: u8,
+        ) -> FilterListMetadataResult;
+    }
     extern "Rust" {
         type Engine;
         /// Creates a new engine with no rules.
         fn new_engine() -> Box<Engine>;
         /// Creates a new engine with rules from a given filter list.
         fn engine_with_rules(rules: &CxxVector<u8>) -> BoxEngineResult;
+        /// Creates a new engine with rules from a given filter set.
+        fn engine_from_filter_set(filter_set: Box<FilterSet>) -> BoxEngineResult;
 
         /// Configures the adblock domain resolver to the call
         /// `resolve_domain_position` implemented in adblock_domain_resolver.cc.
@@ -187,6 +201,12 @@ mod ffi {
         error_message: String,
     }
 
+    struct FilterListMetadataResult {
+        value: FilterListMetadata,
+        result_kind: ResultKind,
+        error_message: String,
+    }
+
     // Created custom Option struct because automatic conversion of Option<T>
     // is not yet supported in cxx.
     #[derive(Default)]
diff --git a/components/brave_shields/adblock/rs/src/result.rs b/components/brave_shields/adblock/rs/src/result.rs
index a1e4addbd9b4..4e96179087fc 100644
--- a/components/brave_shields/adblock/rs/src/result.rs
+++ b/components/brave_shields/adblock/rs/src/result.rs
@@ -83,6 +83,7 @@ where
 
 impl_result_from_trait!(VecStringResult, Vec<String>);
 impl_result_from_trait!(BoxEngineResult, Box<Engine>);
+impl_result_from_trait!(FilterListMetadataResult, FilterListMetadata);
 #[cfg(feature = "ios")]
 impl_result_from_trait!(ContentBlockingRulesResult, ContentBlockingRules);
 
diff --git a/components/brave_shields/browser/BUILD.gn b/components/brave_shields/browser/BUILD.gn
index 5942f4279e23..ac40d3fd61f5 100644
--- a/components/brave_shields/browser/BUILD.gn
+++ b/components/brave_shields/browser/BUILD.gn
@@ -8,6 +8,8 @@ if (!is_ios) {
     sources = [
       "ad_block_component_filters_provider.cc",
       "ad_block_component_filters_provider.h",
+      "ad_block_component_service_manager.cc",
+      "ad_block_component_service_manager.h",
       "ad_block_custom_filters_provider.cc",
       "ad_block_custom_filters_provider.h",
       "ad_block_default_resource_provider.cc",
@@ -24,8 +26,6 @@ if (!is_ios) {
       "ad_block_localhost_filters_provider.h",
       "ad_block_pref_service.cc",
       "ad_block_pref_service.h",
-      "ad_block_regional_service_manager.cc",
-      "ad_block_regional_service_manager.h",
       "ad_block_resource_provider.cc",
       "ad_block_resource_provider.h",
       "ad_block_service.cc",
diff --git a/components/brave_shields/browser/ad_block_component_filters_provider.cc b/components/brave_shields/browser/ad_block_component_filters_provider.cc
index 9bd489ddf2ee..7aa7b5f33a07 100644
--- a/components/brave_shields/browser/ad_block_component_filters_provider.cc
+++ b/components/brave_shields/browser/ad_block_component_filters_provider.cc
@@ -21,14 +21,29 @@ constexpr char kListFile[] = "list.txt";
 
 namespace brave_shields {
 
+namespace {
+
+// static
+void AddDATBufferToFilterSet(base::OnceCallback<void()> cb,
+                             rust::Box<adblock::FilterSet>* filter_set,
+                             uint8_t permission_mask,
+                             DATFileDataBuffer buffer) {
+  (*filter_set)->add_filter_list_with_permissions(buffer, permission_mask);
+  std::move(cb).Run();
+}
+
+}  // namespace
+
 AdBlockComponentFiltersProvider::AdBlockComponentFiltersProvider(
     component_updater::ComponentUpdateService* cus,
     std::string component_id,
     std::string base64_public_key,
     std::string title,
+    uint8_t permission_mask,
     bool is_default_engine)
     : AdBlockFiltersProvider(is_default_engine),
       component_id_(component_id),
+      permission_mask_(permission_mask),
       component_updater_service_(cus) {
   // Can be nullptr in unit tests
   if (cus) {
@@ -51,6 +66,7 @@ AdBlockComponentFiltersProvider::AdBlockComponentFiltersProvider(
                                       catalog_entry.component_id,
                                       catalog_entry.base64_public_key,
                                       catalog_entry.title,
+                                      catalog_entry.permission_mask,
                                       is_default_engine) {}
 
 AdBlockComponentFiltersProvider::~AdBlockComponentFiltersProvider() {}
@@ -69,13 +85,13 @@ void AdBlockComponentFiltersProvider::OnComponentReady(
   NotifyObservers();
 }
 
-void AdBlockComponentFiltersProvider::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+void AdBlockComponentFiltersProvider::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
   if (component_path_.empty()) {
-    // If the path is not ready yet, run the callback with an empty list. An
+    // If the path is not ready yet, run the callback with no changes. An
     // update will be pushed later to notify about the newly available list.
-    std::move(cb).Run(false, DATFileDataBuffer());
+    std::move(cb).Run();
     return;
   }
 
@@ -84,7 +100,8 @@ void AdBlockComponentFiltersProvider::LoadDATBuffer(
   base::ThreadPool::PostTaskAndReplyWithResult(
       FROM_HERE, {base::MayBlock()},
       base::BindOnce(&brave_component_updater::ReadDATFileData, list_file_path),
-      base::BindOnce(std::move(cb), false));
+      base::BindOnce(&AddDATBufferToFilterSet, std::move(cb), filter_set,
+                     permission_mask_));
 }
 
 }  // namespace brave_shields
diff --git a/components/brave_shields/browser/ad_block_component_filters_provider.h b/components/brave_shields/browser/ad_block_component_filters_provider.h
index 0b369351aa40..2e09006c1f68 100644
--- a/components/brave_shields/browser/ad_block_component_filters_provider.h
+++ b/components/brave_shields/browser/ad_block_component_filters_provider.h
@@ -38,6 +38,7 @@ class AdBlockComponentFiltersProvider : public AdBlockFiltersProvider {
       std::string component_id,
       std::string base64_public_key,
       std::string title,
+      uint8_t permission_mask,
       bool is_default_engine = true);
   // Helper to build a particular adblock component from a catalog entry
   AdBlockComponentFiltersProvider(
@@ -50,9 +51,8 @@ class AdBlockComponentFiltersProvider : public AdBlockFiltersProvider {
   AdBlockComponentFiltersProvider& operator=(
       const AdBlockComponentFiltersProvider&) = delete;
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) override;
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
 
   // Remove the component. This will force it to be redownloaded next time it
   // is registered.
@@ -68,6 +68,7 @@ class AdBlockComponentFiltersProvider : public AdBlockFiltersProvider {
 
   base::FilePath component_path_;
   std::string component_id_;
+  uint8_t permission_mask_;
   const raw_ptr<component_updater::ComponentUpdateService>
       component_updater_service_;
 
diff --git a/components/brave_shields/browser/ad_block_regional_service_manager.cc b/components/brave_shields/browser/ad_block_component_service_manager.cc
similarity index 68%
rename from components/brave_shields/browser/ad_block_regional_service_manager.cc
rename to components/brave_shields/browser/ad_block_component_service_manager.cc
index 48d4c7894159..e873461c6f89 100644
--- a/components/brave_shields/browser/ad_block_regional_service_manager.cc
+++ b/components/brave_shields/browser/ad_block_component_service_manager.cc
@@ -1,9 +1,9 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
+/* Copyright (c) 2023 The Brave Authors. All rights reserved.
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 
 #include <memory>
 #include <utility>
@@ -31,19 +31,16 @@ namespace {
 
 typedef struct ListDefaultOverrideConstants {
   const raw_ref<const base::Feature> feature;
-  const char* local_override_pref;
   const char* list_uuid;
 } ListDefaultOverrideConstants;
 
 const ListDefaultOverrideConstants kCookieListConstants{
     .feature = raw_ref<const base::Feature>(kBraveAdblockCookieListDefault),
-    .local_override_pref = prefs::kAdBlockCookieListSettingTouched,
     .list_uuid = kCookieListUuid};
 
 const ListDefaultOverrideConstants kMobileNotificationsListConstants{
     .feature = raw_ref<const base::Feature>(
         kBraveAdblockMobileNotificationsListDefault),
-    .local_override_pref = prefs::kAdBlockMobileNotificationsListSettingTouched,
     .list_uuid = kMobileNotificationsListUuid};
 
 const ListDefaultOverrideConstants kOverrideConstants[2] = {
@@ -51,7 +48,7 @@ const ListDefaultOverrideConstants kOverrideConstants[2] = {
 
 }  // namespace
 
-AdBlockRegionalServiceManager::AdBlockRegionalServiceManager(
+AdBlockComponentServiceManager::AdBlockComponentServiceManager(
     PrefService* local_state,
     std::string locale,
     component_updater::ComponentUpdateService* cus,
@@ -61,12 +58,12 @@ AdBlockRegionalServiceManager::AdBlockRegionalServiceManager(
       component_update_service_(cus),
       catalog_provider_(catalog_provider) {
   catalog_provider_->LoadFilterListCatalog(
-      base::BindOnce(&AdBlockRegionalServiceManager::OnFilterListCatalogLoaded,
+      base::BindOnce(&AdBlockComponentServiceManager::OnFilterListCatalogLoaded,
                      weak_factory_.GetWeakPtr()));
   catalog_provider_->AddObserver(this);
 }
 
-AdBlockRegionalServiceManager::~AdBlockRegionalServiceManager() {
+AdBlockComponentServiceManager::~AdBlockComponentServiceManager() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   catalog_provider_->RemoveObserver(this);
 }
@@ -75,7 +72,7 @@ AdBlockRegionalServiceManager::~AdBlockRegionalServiceManager() {
 // might have been enabled. If so, make sure the user hasn't explicitly
 // modified any of these locale-specific list settings, to determine if all
 // should be enabled.
-bool AdBlockRegionalServiceManager::NeedsLocaleListsMigration(
+bool AdBlockComponentServiceManager::NeedsLocaleListsMigration(
     std::vector<std::reference_wrapper<FilterListCatalogEntry const>>
         locale_lists) {
   // This can only apply to locales with more than one available list
@@ -96,10 +93,11 @@ bool AdBlockRegionalServiceManager::NeedsLocaleListsMigration(
   return true;
 }
 
-void AdBlockRegionalServiceManager::StartRegionalServices() {
+void AdBlockComponentServiceManager::StartRegionalServices() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-  if (!local_state_)
+  if (!local_state_) {
     return;
+  }
 
   if (filter_list_catalog_.size() == 0) {
     return;
@@ -125,77 +123,48 @@ void AdBlockRegionalServiceManager::StartRegionalServices() {
     local_state_->SetBoolean(prefs::kAdBlockCheckedAllDefaultRegions, true);
   }
 
-  // Start all regional services associated with enabled filter lists
-  const auto& regional_filters_dict =
-      local_state_->GetDict(prefs::kAdBlockRegionalFilters);
-
-  auto regional_filters_dict_with_overrides = regional_filters_dict.Clone();
-  for (const auto& constants : kOverrideConstants) {
-    const bool list_touched =
-        local_state_->GetBoolean(constants.local_override_pref);
-
-    if (base::FeatureList::IsEnabled(*constants.feature) && !list_touched) {
-      base::Value::Dict list_entry;
-      list_entry.Set("enabled", true);
-      regional_filters_dict_with_overrides.Set(constants.list_uuid,
-                                               std::move(list_entry));
-    }
-  }
-
-  for (const auto kv : regional_filters_dict_with_overrides) {
-    const std::string uuid = kv.first;
-    bool enabled = false;
-    const auto* regional_filter_dict =
-        regional_filters_dict_with_overrides.FindDict(uuid);
-    if (regional_filter_dict) {
-      enabled = regional_filter_dict->FindBool("enabled").value_or(false);
-    }
-    if (enabled) {
-      auto catalog_entry = brave_shields::FindAdBlockFilterListByUUID(
-          filter_list_catalog_, uuid);
-      auto existing_provider = regional_filters_providers_.find(uuid);
-      // Iterating through locally enabled lists - don't disable any providers
-      // or update existing providers with a potentially new catalog entry.
+  // Start component services associated with enabled filter lists
+  for (const auto& catalog_entry : filter_list_catalog_) {
+    if (IsFilterListEnabled(catalog_entry.uuid)) {
+      auto existing_provider =
+          regional_filters_providers_.find(catalog_entry.uuid);
+      // Only check for new lists that are part of the catalog - don't touch any
+      // existing providers to account for modified or removed catalog entries.
       // They'll be handled after a browser restart.
-      if (catalog_entry != filter_list_catalog_.end() &&
-          existing_provider == regional_filters_providers_.end()) {
+      if (existing_provider == regional_filters_providers_.end()) {
         auto regional_filters_provider =
             std::make_unique<AdBlockComponentFiltersProvider>(
-                component_update_service_, *catalog_entry, false);
+                component_update_service_, catalog_entry,
+                catalog_entry.first_party_protections);
         regional_filters_providers_.insert(
-            {uuid, std::move(regional_filters_provider)});
+            {catalog_entry.uuid, std::move(regional_filters_provider)});
       }
     }
   }
 }
 
-void AdBlockRegionalServiceManager::UpdateFilterListPrefs(
+void AdBlockComponentServiceManager::UpdateFilterListPrefs(
     const std::string& uuid,
     bool enabled) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-  if (!local_state_)
+  if (!local_state_) {
     return;
+  }
   ScopedDictPrefUpdate update(local_state_, prefs::kAdBlockRegionalFilters);
   base::Value::Dict regional_filter_dict;
   regional_filter_dict.Set("enabled", enabled);
   update->Set(uuid, std::move(regional_filter_dict));
 
-  for (const auto& constants : kOverrideConstants) {
-    if (uuid == constants.list_uuid) {
-      local_state_->SetBoolean(constants.local_override_pref, true);
-    }
-  }
-
   RecordP3ACookieListEnabled();
 }
 
-void AdBlockRegionalServiceManager::RecordP3ACookieListEnabled() {
+void AdBlockComponentServiceManager::RecordP3ACookieListEnabled() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   UMA_HISTOGRAM_BOOLEAN(kCookieListEnabledHistogram,
                         IsFilterListEnabled(kCookieListUuid));
 }
 
-bool AdBlockRegionalServiceManager::IsFilterListAvailable(
+bool AdBlockComponentServiceManager::IsFilterListAvailable(
     const std::string& uuid) const {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DCHECK(!uuid.empty());
@@ -204,32 +173,49 @@ bool AdBlockRegionalServiceManager::IsFilterListAvailable(
   return catalog_entry != filter_list_catalog_.end();
 }
 
-bool AdBlockRegionalServiceManager::IsFilterListEnabled(
+bool AdBlockComponentServiceManager::IsFilterListEnabled(
     const std::string& uuid) const {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DCHECK(!uuid.empty());
   DCHECK(local_state_);
 
+  // Retrieve user's setting for the list from preferences
+  const auto& regional_filters_dict =
+      local_state_->GetDict(prefs::kAdBlockRegionalFilters);
+  const auto* user_pref_dict = regional_filters_dict.FindDict(uuid);
+  const bool list_touched = user_pref_dict;
+
+  // Apply feature overrides from Griffin without overriding user preference
   for (const auto& constants : kOverrideConstants) {
     if (uuid == constants.list_uuid &&
-        base::FeatureList::IsEnabled(*constants.feature) &&
-        !local_state_->GetBoolean(constants.local_override_pref)) {
+        base::FeatureList::IsEnabled(*constants.feature) && !list_touched) {
       return true;
     }
   }
 
-  const auto& regional_filters_dict =
-      local_state_->GetDict(prefs::kAdBlockRegionalFilters);
+  // Apply overrides for lists with a `default_enabled` designation in the
+  // catalog
+  auto catalog_entry =
+      brave_shields::FindAdBlockFilterListByUUID(filter_list_catalog_, uuid);
+  if (catalog_entry != filter_list_catalog_.end() &&
+      catalog_entry->default_enabled) {
+    // prefer any user setting for the list, unless it's hidden
+    if (!list_touched || catalog_entry->hidden) {
+      return true;
+    }
+  }
 
-  if (const auto* regional_filter_dict = regional_filters_dict.FindDict(uuid)) {
-    return regional_filter_dict->FindBool("enabled").value_or(false);
+  // Use the user's preference if there was no valid override
+  if (user_pref_dict) {
+    return user_pref_dict->FindBool("enabled").value_or(false);
   }
 
+  // Otherwise the list is disabled
   return false;
 }
 
-void AdBlockRegionalServiceManager::EnableFilterList(const std::string& uuid,
-                                                     bool enabled) {
+void AdBlockComponentServiceManager::EnableFilterList(const std::string& uuid,
+                                                      bool enabled) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DCHECK(!uuid.empty());
   auto catalog_entry =
@@ -246,7 +232,8 @@ void AdBlockRegionalServiceManager::EnableFilterList(const std::string& uuid,
     }
     auto regional_filters_provider =
         std::make_unique<AdBlockComponentFiltersProvider>(
-            component_update_service_, *catalog_entry, false);
+            component_update_service_, *catalog_entry,
+            catalog_entry->first_party_protections);
     regional_filters_providers_.insert(
         {uuid, std::move(regional_filters_provider)});
   } else {
@@ -262,7 +249,7 @@ void AdBlockRegionalServiceManager::EnableFilterList(const std::string& uuid,
   UpdateFilterListPrefs(uuid, enabled);
 }
 
-void AdBlockRegionalServiceManager::SetFilterListCatalog(
+void AdBlockComponentServiceManager::SetFilterListCatalog(
     std::vector<FilterListCatalogEntry> catalog) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   filter_list_catalog_ = std::move(catalog);
@@ -271,17 +258,20 @@ void AdBlockRegionalServiceManager::SetFilterListCatalog(
 }
 
 const std::vector<FilterListCatalogEntry>&
-AdBlockRegionalServiceManager::GetFilterListCatalog() {
+AdBlockComponentServiceManager::GetFilterListCatalog() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   return filter_list_catalog_;
 }
 
-base::Value::List AdBlockRegionalServiceManager::GetRegionalLists() {
+base::Value::List AdBlockComponentServiceManager::GetRegionalLists() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DCHECK(local_state_);
 
   base::Value::List list;
   for (const auto& region_list : filter_list_catalog_) {
+    if (region_list.hidden) {
+      continue;
+    }
     // Most settings come directly from the regional catalog from
     // https://github.com/brave/adblock-resources
     base::Value::Dict dict;
@@ -301,7 +291,7 @@ base::Value::List AdBlockRegionalServiceManager::GetRegionalLists() {
   return list;
 }
 
-void AdBlockRegionalServiceManager::OnFilterListCatalogLoaded(
+void AdBlockComponentServiceManager::OnFilterListCatalogLoaded(
     const std::string& catalog_json) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   SetFilterListCatalog(FilterListCatalogFromJSON(catalog_json));
diff --git a/components/brave_shields/browser/ad_block_regional_service_manager.h b/components/brave_shields/browser/ad_block_component_service_manager.h
similarity index 74%
rename from components/brave_shields/browser/ad_block_regional_service_manager.h
rename to components/brave_shields/browser/ad_block_component_service_manager.h
index c0d9df1ad25d..61121d945c26 100644
--- a/components/brave_shields/browser/ad_block_regional_service_manager.h
+++ b/components/brave_shields/browser/ad_block_component_service_manager.h
@@ -1,10 +1,10 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
+/* Copyright (c) 2023 The Brave Authors. All rights reserved.
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-#ifndef BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_REGIONAL_SERVICE_MANAGER_H_
-#define BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_REGIONAL_SERVICE_MANAGER_H_
+#ifndef BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_COMPONENT_SERVICE_MANAGER_H_
+#define BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_COMPONENT_SERVICE_MANAGER_H_
 
 #include <map>
 #include <memory>
@@ -25,20 +25,21 @@ namespace brave_shields {
 
 class FilterListCatalogEntry;
 
-// The AdBlock regional service manager, in charge of initializing and
-// managing regional AdBlock clients.
-class AdBlockRegionalServiceManager
+// The adblock component service manager, in charge of initializing and
+// managing adblock lists served via CRX components.
+class AdBlockComponentServiceManager
     : public AdBlockFilterListCatalogProvider::Observer {
  public:
-  explicit AdBlockRegionalServiceManager(
+  explicit AdBlockComponentServiceManager(
       PrefService* local_state,
       std::string locale,
       component_updater::ComponentUpdateService* cus,
       AdBlockFilterListCatalogProvider* catalog_provider);
-  AdBlockRegionalServiceManager(const AdBlockRegionalServiceManager&) = delete;
-  AdBlockRegionalServiceManager& operator=(
-      const AdBlockRegionalServiceManager&) = delete;
-  ~AdBlockRegionalServiceManager() override;
+  AdBlockComponentServiceManager(const AdBlockComponentServiceManager&) =
+      delete;
+  AdBlockComponentServiceManager& operator=(
+      const AdBlockComponentServiceManager&) = delete;
+  ~AdBlockComponentServiceManager() override;
 
   base::Value::List GetRegionalLists();
 
@@ -85,9 +86,9 @@ class AdBlockRegionalServiceManager
 
   SEQUENCE_CHECKER(sequence_checker_);
 
-  base::WeakPtrFactory<AdBlockRegionalServiceManager> weak_factory_{this};
+  base::WeakPtrFactory<AdBlockComponentServiceManager> weak_factory_{this};
 };
 
 }  // namespace brave_shields
 
-#endif  // BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_REGIONAL_SERVICE_MANAGER_H_
+#endif  // BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_COMPONENT_SERVICE_MANAGER_H_
diff --git a/components/brave_shields/browser/ad_block_component_service_unittest.cc b/components/brave_shields/browser/ad_block_component_service_unittest.cc
new file mode 100644
index 000000000000..091dd973e9fc
--- /dev/null
+++ b/components/brave_shields/browser/ad_block_component_service_unittest.cc
@@ -0,0 +1,66 @@
+/* Copyright (c) 2023 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "brave/components/brave_shields/browser/filter_list_catalog_entry.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(AdBlockComponentServiceTest, UserModelLanguages) {
+  std::vector<brave_shields::FilterListCatalogEntry> catalog;
+  catalog.push_back(brave_shields::FilterListCatalogEntry(
+      "uuid", "https://brave.com", "Testing Filter List #1", {"fr"},
+      "https://support.brave.com", "Filter list for testing purposes", false,
+      false, false, 0, "componentid", "base64publickey", "", ""));
+  catalog.push_back(brave_shields::FilterListCatalogEntry(
+      "uuid", "https://brave.com", "Testing Filter List #2", {"en"},
+      "https://support.brave.com", "Filter list for testing purposes", false,
+      false, false, 0, "componentid", "base64publickey", "", ""));
+  catalog.push_back(brave_shields::FilterListCatalogEntry(
+      "uuid", "https://brave.com", "Testing Filter List #2", {"fr"},
+      "https://support.brave.com", "Filter list for testing purposes", false,
+      false, false, 0, "componentid", "base64publickey", "", ""));
+
+  std::vector<std::string> languages({"fr", "fR", "fr-FR", "fr-ca"});
+  std::for_each(
+      languages.begin(), languages.end(), [&](const std::string& language) {
+        EXPECT_EQ(
+            brave_shields::FindAdBlockFilterListsByLocale(catalog, language)
+                .size(),
+            2UL);
+      });
+
+  EXPECT_EQ(brave_shields::FindAdBlockFilterListsByLocale(catalog, "en").size(),
+            1UL);
+
+  EXPECT_EQ(brave_shields::FindAdBlockFilterListsByLocale(catalog, "is").size(),
+            0UL);
+}
+
+TEST(AdBlockComponentServiceTest, MissingFieldDefaultValues) {
+  auto catalog = brave_shields::FilterListCatalogFromJSON(R"([{
+      "uuid": "uuid",
+      "title": "Test list",
+      "desc": "Just used for testing",
+      "langs": [],
+      "component_id": "componentid",
+      "base64_public_key": "base64publickey",
+      "list_text_component": {
+          "component_id": "componentid",
+          "base64_public_key": "base64publickey"
+      },
+      "sources": [
+          {
+              "url": "https://example.com",
+              "format": "Standard",
+              "support_url": "https://support.example.com"
+          }
+      ]
+  }])");
+
+  ASSERT_EQ(catalog.size(), 1UL);
+  ASSERT_EQ(catalog[0].hidden, false);
+  ASSERT_EQ(catalog[0].default_enabled, false);
+  ASSERT_EQ(catalog[0].first_party_protections, false);
+  ASSERT_EQ(catalog[0].permission_mask, 0);
+}
diff --git a/components/brave_shields/browser/ad_block_custom_filters_provider.cc b/components/brave_shields/browser/ad_block_custom_filters_provider.cc
index 51e35dafa0fa..9bcdc69cd4e5 100644
--- a/components/brave_shields/browser/ad_block_custom_filters_provider.cc
+++ b/components/brave_shields/browser/ad_block_custom_filters_provider.cc
@@ -15,6 +15,14 @@
 
 namespace brave_shields {
 
+namespace {
+
+// Custom filters get all permissions granted, i.e. all bits of the mask set,
+// i.e. the maximum possible uint8_t.
+const uint8_t kCustomFiltersPermissionLevel = UINT8_MAX;
+
+}  // namespace
+
 AdBlockCustomFiltersProvider::AdBlockCustomFiltersProvider(
     PrefService* local_state)
     : AdBlockFiltersProvider(false), local_state_(local_state) {}
@@ -59,18 +67,20 @@ bool AdBlockCustomFiltersProvider::UpdateCustomFilters(
   return true;
 }
 
-void AdBlockCustomFiltersProvider::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+void AdBlockCustomFiltersProvider::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   auto custom_filters = GetCustomFilters();
 
   auto buffer =
       std::vector<unsigned char>(custom_filters.begin(), custom_filters.end());
+  (*filter_set)
+      ->add_filter_list_with_permissions(buffer, kCustomFiltersPermissionLevel);
 
   // PostTask so this has an async return to match other loaders
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(std::move(cb), false, std::move(buffer)));
+      FROM_HERE, base::BindOnce(std::move(cb)));
 }
 
 // The custom filters provider can provide its filters immediately after being
diff --git a/components/brave_shields/browser/ad_block_custom_filters_provider.h b/components/brave_shields/browser/ad_block_custom_filters_provider.h
index fd229627182e..f1c6fd6c0d2b 100644
--- a/components/brave_shields/browser/ad_block_custom_filters_provider.h
+++ b/components/brave_shields/browser/ad_block_custom_filters_provider.h
@@ -35,9 +35,8 @@ class AdBlockCustomFiltersProvider : public AdBlockFiltersProvider {
   std::string GetCustomFilters();
   bool UpdateCustomFilters(const std::string& custom_filters);
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) override;
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
 
   // AdBlockFiltersProvider
   void AddObserver(AdBlockFiltersProvider::Observer* observer);
diff --git a/components/brave_shields/browser/ad_block_engine.cc b/components/brave_shields/browser/ad_block_engine.cc
index 5aa3f42b6551..0085948063e2 100644
--- a/components/brave_shields/browser/ad_block_engine.cc
+++ b/components/brave_shields/browser/ad_block_engine.cc
@@ -250,6 +250,11 @@ void AdBlockEngine::Load(bool deserialize,
   }
 }
 
+void AdBlockEngine::Load(rust::Box<adblock::FilterSet> filter_set,
+                         const std::string& resources_json) {
+  OnFilterSetLoaded(std::move(filter_set), resources_json);
+}
+
 void AdBlockEngine::UpdateAdBlockClient(
     rust::Box<adblock::Engine> ad_block_client,
     const std::string& resources_json) {
@@ -273,6 +278,17 @@ void AdBlockEngine::AddKnownTagsToAdBlockInstance() {
   });
 }
 
+void AdBlockEngine::OnFilterSetLoaded(rust::Box<adblock::FilterSet> filter_set,
+                                      const std::string& resources_json) {
+  auto result = adblock::engine_from_filter_set(std::move(filter_set));
+  if (result.result_kind != adblock::ResultKind::Success) {
+    VLOG(0) << "AdBlockEngine::OnFilterSetLoaded failed: "
+            << result.error_message.c_str();
+    return;
+  }
+  UpdateAdBlockClient(std::move(result.value), resources_json);
+}
+
 void AdBlockEngine::OnListSourceLoaded(const DATFileDataBuffer& filters,
                                        const std::string& resources_json) {
   auto result = adblock::engine_with_rules(filters);
diff --git a/components/brave_shields/browser/ad_block_engine.h b/components/brave_shields/browser/ad_block_engine.h
index 0e615dbc0a16..c9c5bf0c32f1 100644
--- a/components/brave_shields/browser/ad_block_engine.h
+++ b/components/brave_shields/browser/ad_block_engine.h
@@ -71,6 +71,8 @@ class AdBlockEngine : public base::SupportsWeakPtr<AdBlockEngine> {
   void Load(bool deserialize,
             const DATFileDataBuffer& dat_buf,
             const std::string& resources_json);
+  void Load(rust::Box<adblock::FilterSet> filter_set,
+            const std::string& resources_json);
 
   class TestObserver : public base::CheckedObserver {
    public:
@@ -84,9 +86,11 @@ class AdBlockEngine : public base::SupportsWeakPtr<AdBlockEngine> {
   void AddKnownTagsToAdBlockInstance();
   void UpdateAdBlockClient(rust::Box<adblock::Engine> ad_block_client,
                            const std::string& resources_json);
+
+  void OnFilterSetLoaded(rust::Box<adblock::FilterSet> filter_set,
+                         const std::string& resources_json);
   void OnListSourceLoaded(const DATFileDataBuffer& filters,
                           const std::string& resources_json);
-
   void OnDATLoaded(const DATFileDataBuffer& dat_buf,
                    const std::string& resources_json);
 
diff --git a/components/brave_shields/browser/ad_block_filter_list_catalog_provider.cc b/components/brave_shields/browser/ad_block_filter_list_catalog_provider.cc
index 177cba29fd35..e93847b8a4f6 100644
--- a/components/brave_shields/browser/ad_block_filter_list_catalog_provider.cc
+++ b/components/brave_shields/browser/ad_block_filter_list_catalog_provider.cc
@@ -11,7 +11,7 @@
 #include "brave/components/brave_shields/browser/ad_block_component_installer.h"
 #include "brave/components/brave_shields/browser/ad_block_filter_list_catalog_provider.h"
 
-constexpr char kRegionalCatalogFile[] = "regional_catalog.json";
+constexpr char kListCatalogFile[] = "list_catalog.json";
 
 namespace brave_shields {
 
@@ -53,7 +53,7 @@ void AdBlockFilterListCatalogProvider::OnComponentReady(
   base::ThreadPool::PostTaskAndReplyWithResult(
       FROM_HERE, {base::MayBlock()},
       base::BindOnce(&brave_component_updater::GetDATFileAsString,
-                     component_path_.AppendASCII(kRegionalCatalogFile)),
+                     component_path_.AppendASCII(kListCatalogFile)),
       base::BindOnce(
           &AdBlockFilterListCatalogProvider::OnFilterListCatalogLoaded,
           weak_factory_.GetWeakPtr()));
@@ -70,7 +70,7 @@ void AdBlockFilterListCatalogProvider::LoadFilterListCatalog(
   base::ThreadPool::PostTaskAndReplyWithResult(
       FROM_HERE, {base::MayBlock()},
       base::BindOnce(&brave_component_updater::GetDATFileAsString,
-                     component_path_.AppendASCII(kRegionalCatalogFile)),
+                     component_path_.AppendASCII(kListCatalogFile)),
       std::move(cb));
 }
 
diff --git a/components/brave_shields/browser/ad_block_filters_provider.cc b/components/brave_shields/browser/ad_block_filters_provider.cc
index 4c20c9d840eb..5a50402f975e 100644
--- a/components/brave_shields/browser/ad_block_filters_provider.cc
+++ b/components/brave_shields/browser/ad_block_filters_provider.cc
@@ -42,12 +42,6 @@ void AdBlockFiltersProvider::NotifyObservers() {
   }
 }
 
-void AdBlockFiltersProvider::LoadDAT(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
-  LoadDATBuffer(std::move(cb));
-}
-
 base::WeakPtr<AdBlockFiltersProvider> AdBlockFiltersProvider::AsWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
diff --git a/components/brave_shields/browser/ad_block_filters_provider.h b/components/brave_shields/browser/ad_block_filters_provider.h
index 479c4a55776d..94f0cd42df02 100644
--- a/components/brave_shields/browser/ad_block_filters_provider.h
+++ b/components/brave_shields/browser/ad_block_filters_provider.h
@@ -13,6 +13,7 @@
 #include "base/observer_list.h"
 #include "base/observer_list_types.h"
 #include "brave/components/brave_component_updater/browser/dat_file_util.h"
+#include "brave/components/brave_shields/adblock/rs/src/lib.rs.h"
 
 using brave_component_updater::DATFileDataBuffer;
 
@@ -37,8 +38,8 @@ class AdBlockFiltersProvider {
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
-  void LoadDAT(base::OnceCallback<void(bool deserialize,
-                                       const DATFileDataBuffer& dat_buf)>);
+  virtual void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                             base::OnceCallback<void()>) = 0;
 
   base::WeakPtr<AdBlockFiltersProvider> AsWeakPtr();
 
@@ -47,9 +48,6 @@ class AdBlockFiltersProvider {
  protected:
   bool engine_is_default_;
 
-  virtual void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) = 0;
   void NotifyObservers();
 
  private:
diff --git a/components/brave_shields/browser/ad_block_filters_provider_manager.cc b/components/brave_shields/browser/ad_block_filters_provider_manager.cc
index ce0379431bcd..4b454d1fea32 100644
--- a/components/brave_shields/browser/ad_block_filters_provider_manager.cc
+++ b/components/brave_shields/browser/ad_block_filters_provider_manager.cc
@@ -9,7 +9,7 @@
 #include <string>
 #include <utility>
 
-#include "base/barrier_callback.h"
+#include "base/barrier_closure.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/no_destructor.h"
@@ -18,22 +18,6 @@
 
 namespace brave_shields {
 
-namespace {
-
-static void OnDATLoaded(
-    base::OnceCallback<void(DATFileDataBuffer)> collect_and_merge,
-    bool deserialize,
-    const DATFileDataBuffer& dat_buf) {
-  // This manager should never be used for a provider that returns a serialized
-  // DAT. The ability should be removed from the FiltersProvider API when
-  // possible.
-  CHECK(!deserialize);
-
-  std::move(collect_and_merge).Run(dat_buf);
-}
-
-}  // namespace
-
 // static
 AdBlockFiltersProviderManager* AdBlockFiltersProviderManager::GetInstance() {
   static base::NoDestructor<AdBlockFiltersProviderManager> instance;
@@ -67,7 +51,7 @@ void AdBlockFiltersProviderManager::RemoveProvider(
 }
 
 std::string AdBlockFiltersProviderManager::GetNameForDebugging() {
-  return "AdBlockCustomFiltersProvider";
+  return "AdBlockFiltersProviderManager";
 }
 
 void AdBlockFiltersProviderManager::OnChanged() {
@@ -75,47 +59,28 @@ void AdBlockFiltersProviderManager::OnChanged() {
 }
 
 // Use LoadDATBufferForEngine instead, for Filter Provider Manager.
-void AdBlockFiltersProviderManager::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+void AdBlockFiltersProviderManager::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()>) {
   NOTREACHED();
 }
 
-void AdBlockFiltersProviderManager::LoadDATBufferForEngine(
+void AdBlockFiltersProviderManager::LoadFilterSetForEngine(
     bool is_for_default_engine,
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
   auto& filters_providers = is_for_default_engine
                                 ? default_engine_filters_providers_
                                 : additional_engine_filters_providers_;
-  const auto collect_and_merge = base::BarrierCallback<DATFileDataBuffer>(
-      filters_providers.size(),
-      base::BindOnce(&AdBlockFiltersProviderManager::FinishCombinating,
-                     weak_factory_.GetWeakPtr(), std::move(cb)));
+  const auto collect_and_merge =
+      base::BarrierClosure(filters_providers.size(), std::move(cb));
   for (auto* const provider : filters_providers) {
     task_tracker_.PostTask(
         base::SequencedTaskRunner::GetCurrentDefault().get(), FROM_HERE,
-        base::BindOnce(
-            &AdBlockFiltersProvider::LoadDAT, provider->AsWeakPtr(),
-            base::BindOnce(OnDATLoaded, std::move(collect_and_merge))));
-  }
-}
-
-void AdBlockFiltersProviderManager::FinishCombinating(
-    base::OnceCallback<void(bool, const DATFileDataBuffer&)> cb,
-    const std::vector<DATFileDataBuffer>& results) {
-  DATFileDataBuffer combined_list;
-  for (const auto& dat_buf : results) {
-    combined_list.push_back('\n');
-    combined_list.insert(combined_list.end(), dat_buf.begin(), dat_buf.end());
-  }
-  if (combined_list.size() == 0) {
-    // Small workaround for code in
-    // AdBlockService::SourceProviderObserver::OnResourcesLoaded that encodes a
-    // state using an entirely empty DAT.
-    combined_list.push_back('\n');
+        base::BindOnce(&AdBlockFiltersProvider::LoadFilterSet,
+                       provider->AsWeakPtr(), filter_set,
+                       std::move(collect_and_merge)));
   }
-  std::move(cb).Run(false, combined_list);
 }
 
 }  // namespace brave_shields
diff --git a/components/brave_shields/browser/ad_block_filters_provider_manager.h b/components/brave_shields/browser/ad_block_filters_provider_manager.h
index a74cbffba576..64da33887982 100644
--- a/components/brave_shields/browser/ad_block_filters_provider_manager.h
+++ b/components/brave_shields/browser/ad_block_filters_provider_manager.h
@@ -13,6 +13,7 @@
 #include "base/functional/callback.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "brave/components/brave_component_updater/browser/dat_file_util.h"
+#include "brave/components/brave_shields/adblock/rs/src/lib.rs.h"
 #include "brave/components/brave_shields/browser/ad_block_filters_provider.h"
 
 using brave_component_updater::DATFileDataBuffer;
@@ -41,14 +42,12 @@ class AdBlockFiltersProviderManager : public AdBlockFiltersProvider,
 
   static AdBlockFiltersProviderManager* GetInstance();
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) override;
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
 
-  void LoadDATBufferForEngine(
-      bool is_for_default_engine,
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)> cb);
+  void LoadFilterSetForEngine(bool is_for_default_engine,
+                              rust::Box<adblock::FilterSet>* filter_set,
+                              base::OnceCallback<void()> cb);
 
   // AdBlockFiltersProvider::Observer
   void OnChanged() override;
@@ -63,10 +62,6 @@ class AdBlockFiltersProviderManager : public AdBlockFiltersProvider,
  private:
   friend base::NoDestructor<AdBlockFiltersProviderManager>;
 
-  void FinishCombinating(
-      base::OnceCallback<void(bool, const DATFileDataBuffer&)> cb,
-      const std::vector<DATFileDataBuffer>& results);
-
   base::flat_set<AdBlockFiltersProvider*> default_engine_filters_providers_;
   base::flat_set<AdBlockFiltersProvider*> additional_engine_filters_providers_;
 
diff --git a/components/brave_shields/browser/ad_block_localhost_filters_provider.cc b/components/brave_shields/browser/ad_block_localhost_filters_provider.cc
index 37b34f130d28..77d833130826 100644
--- a/components/brave_shields/browser/ad_block_localhost_filters_provider.cc
+++ b/components/brave_shields/browser/ad_block_localhost_filters_provider.cc
@@ -14,6 +14,20 @@
 
 namespace brave_shields {
 
+namespace {
+
+const char kLocalhostBadfilters[] = R"(
+||0.0.0.0^$third-party,domain=~[::]|~[::ffff:0:0],badfilter
+||[::]^$third-party,domain=~0.0.0.0|~[::ffff:0:0],badfilter
+||[::ffff:0:0]^$third-party,domain=~0.0.0.0|~[::],badfilter
+||localhost^$third-party,domain=~127.0.0.1|~[::1]|~[::ffff:7f00:1],badfilter
+||127.0.0.1^$third-party,domain=~localhost|~[::1]|~[::ffff:7f00:1],badfilter
+||[::1]^$third-party,domain=~localhost|~127.0.0.1|~[::ffff:7f00:1],badfilter
+||[::ffff:7f00:1]^$third-party,domain=~localhost|~127.0.0.1|~[::1],badfilter
+)";
+
+}  // namespace
+
 AdBlockLocalhostFiltersProvider::AdBlockLocalhostFiltersProvider()
     : AdBlockFiltersProvider(true) {}
 
@@ -23,28 +37,18 @@ std::string AdBlockLocalhostFiltersProvider::GetNameForDebugging() {
   return "AdBlockLocalhostFiltersProvider";
 }
 
-void AdBlockLocalhostFiltersProvider::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+void AdBlockLocalhostFiltersProvider::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
-  const std::string& badfilters_for_localhost =
-      R"(
-   ||0.0.0.0^$third-party,domain=~[::]|~[::ffff:0:0],badfilter
-   ||[::]^$third-party,domain=~0.0.0.0|~[::ffff:0:0],badfilter
-   ||[::ffff:0:0]^$third-party,domain=~0.0.0.0|~[::],badfilter
-   ||localhost^$third-party,domain=~127.0.0.1|~[::1]|~[::ffff:7f00:1],badfilter
-   ||127.0.0.1^$third-party,domain=~localhost|~[::1]|~[::ffff:7f00:1],badfilter
-   ||[::1]^$third-party,domain=~localhost|~127.0.0.1|~[::ffff:7f00:1],badfilter
-   ||[::ffff:7f00:1]^$third-party,domain=~localhost|~127.0.0.1|~[::1],badfilter
-  )";
-
-  auto buffer = std::vector<unsigned char>(badfilters_for_localhost.begin(),
-                                           badfilters_for_localhost.end());
+  auto buffer = std::vector<unsigned char>(std::begin(kLocalhostBadfilters),
+                                           std::end(kLocalhostBadfilters));
+  (*filter_set)->add_filter_list(buffer);
 
   // PostTask so this has an async return to match other loaders
   base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
-      FROM_HERE, base::BindOnce(std::move(cb), false, std::move(buffer)));
+      FROM_HERE, base::BindOnce(std::move(cb)));
 }
 
 void AdBlockLocalhostFiltersProvider::AddObserver(
diff --git a/components/brave_shields/browser/ad_block_localhost_filters_provider.h b/components/brave_shields/browser/ad_block_localhost_filters_provider.h
index 77aaf97bc180..8864b18259a3 100644
--- a/components/brave_shields/browser/ad_block_localhost_filters_provider.h
+++ b/components/brave_shields/browser/ad_block_localhost_filters_provider.h
@@ -30,9 +30,8 @@ class AdBlockLocalhostFiltersProvider : public AdBlockFiltersProvider {
   std::string GetLocalhostFilters();
   bool UpdateLocalhostFilters(const std::string& localhost_filters);
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) override;
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
 
   // AdBlockFiltersProvider
   void AddObserver(AdBlockFiltersProvider::Observer* observer);
diff --git a/components/brave_shields/browser/ad_block_regional_service_unittest.cc b/components/brave_shields/browser/ad_block_regional_service_unittest.cc
deleted file mode 100644
index e927392d061a..000000000000
--- a/components/brave_shields/browser/ad_block_regional_service_unittest.cc
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Copyright (c) 2019 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/components/brave_shields/browser/filter_list_catalog_entry.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-TEST(AdBlockRegionalServiceTest, UserModelLanguages) {
-  std::vector<brave_shields::FilterListCatalogEntry> catalog;
-  catalog.push_back(brave_shields::FilterListCatalogEntry(
-      "uuid", "https://brave.com", "Testing Filter List #1", {"fr"},
-      "https://support.brave.com", "componentid", "base64publickey",
-      "Filter list for testing purposes", "", ""));
-  catalog.push_back(brave_shields::FilterListCatalogEntry(
-      "uuid", "https://brave.com", "Testing Filter List #2", {"en"},
-      "https://support.brave.com", "componentid", "base64publickey",
-      "Filter list for testing purposes", "", ""));
-  catalog.push_back(brave_shields::FilterListCatalogEntry(
-      "uuid", "https://brave.com", "Testing Filter List #2", {"fr"},
-      "https://support.brave.com", "componentid", "base64publickey",
-      "Filter list for testing purposes", "", ""));
-
-  std::vector<std::string> languages({ "fr", "fR", "fr-FR", "fr-ca" });
-  std::for_each(
-      languages.begin(), languages.end(), [&](const std::string& language) {
-        EXPECT_EQ(
-            brave_shields::FindAdBlockFilterListsByLocale(catalog, language)
-                .size(),
-            2UL);
-      });
-
-  EXPECT_EQ(brave_shields::FindAdBlockFilterListsByLocale(catalog, "en").size(),
-            1UL);
-
-  EXPECT_EQ(brave_shields::FindAdBlockFilterListsByLocale(catalog, "is").size(),
-            0UL);
-}
diff --git a/components/brave_shields/browser/ad_block_service.cc b/components/brave_shields/browser/ad_block_service.cc
index d81bc9640569..b82ff6b36286 100644
--- a/components/brave_shields/browser/ad_block_service.cc
+++ b/components/brave_shields/browser/ad_block_service.cc
@@ -16,13 +16,13 @@
 #include "base/threading/thread_restrictions.h"
 #include "brave/components/brave_shields/adblock/rs/src/lib.rs.h"
 #include "brave/components/brave_shields/browser/ad_block_component_filters_provider.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_custom_filters_provider.h"
 #include "brave/components/brave_shields/browser/ad_block_default_resource_provider.h"
 #include "brave/components/brave_shields/browser/ad_block_engine.h"
 #include "brave/components/brave_shields/browser/ad_block_filter_list_catalog_provider.h"
 #include "brave/components/brave_shields/browser/ad_block_filters_provider_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_localhost_filters_provider.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service_helper.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
 #include "brave/components/brave_shields/common/features.h"
@@ -33,37 +33,6 @@
 #include "third_party/abseil-cpp/absl/types/optional.h"
 #include "url/origin.h"
 
-namespace {
-
-const char kAdBlockDefaultComponentName[] = "Brave Ad Block Updater";
-const char kAdBlockDefaultComponentId[] = "iodkpdagapdfkphljnddpjlldadblomo";
-const char kAdBlockDefaultComponentBase64PublicKey[] =
-    "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsD/B/MGdz0gh7WkcFARn"
-    "ZTBX9KAw2fuGeogijoI+fET38IK0L+P/trCT2NshqhRNmrDpLzV2+Dmes6PvkA+O"
-    "dQkUV6VbChJG+baTfr3Oo5PdE0WxmP9Xh8XD7p85DQrk0jJilKuElxpK7Yq0JhcT"
-    "Sc3XNHeTwBVqCnHwWZZ+XysYQfjuDQ0MgQpS/s7U04OZ63NIPe/iCQm32stvS/pE"
-    "ya7KdBZXgRBQ59U6M1n1Ikkp3vfECShbBld6VrrmNrl59yKWlEPepJ9oqUc2Wf2M"
-    "q+SDNXROG554RnU4BnDJaNETTkDTZ0Pn+rmLmp1qY5Si0yGsfHkrv3FS3vdxVozO"
-    "PQIDAQAB";
-
-const char kAdBlockExceptionComponentName[] =
-    "Brave Ad Block First Party Filters";
-const char kAdBlockExceptionComponentId[] = "adcocjohghhfpidemphmcmlmhnfgikei";
-const char kAdBlockExceptionComponentBase64PublicKey[] =
-    "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtvmLp4MOseThuH/vFSc7"
-    "kjr+CDCzR/ieGI8TJZyFQhzA1SKWRl4y0wB+HGkmoq0KPOzKNZq6hxK7jdm/r/nx"
-    "xOjqutPoUEL+ysxePErMTse2XeWu3psGSTEjPFdQTPEwH8MF2SwXXneOraD0V/GS"
-    "iCCvlx8yKIXNX7V9ujMo+QoD6hPGslKUZQJAg+OaZ7pAfq5cOuWXNN6jv12UL0eM"
-    "t6Dhl31yEu4kZWeTkiccHqdlB/KvPiqXTrV+qd3Tjvsk6kmUlexu3/zlOwVDz5H/"
-    "kPuOGvW7kYaW22NWQ9TH6fjffgVcSgHDbZETDiP8fHd76kyi1SZ5YJ09XHTE+i9i"
-    "kQIDAQAB";
-
-std::string g_ad_block_default_component_id_(kAdBlockDefaultComponentId);
-std::string g_ad_block_default_component_base64_public_key_(
-    kAdBlockDefaultComponentBase64PublicKey);
-
-}  // namespace
-
 namespace brave_shields {
 
 AdBlockService::SourceProviderObserver::SourceProviderObserver(
@@ -78,17 +47,7 @@ AdBlockService::SourceProviderObserver::SourceProviderObserver(
       task_runner_(task_runner),
       is_filter_provider_manager_(is_filter_provider_manager) {
   filters_provider_->AddObserver(this);
-  if (is_filter_provider_manager_) {
-    static_cast<AdBlockFiltersProviderManager*>(filters_provider_.get())
-        ->LoadDATBufferForEngine(
-            adblock_engine_->IsDefaultEngine(),
-            base::BindOnce(&AdBlockService::SourceProviderObserver::OnDATLoaded,
-                           weak_factory_.GetWeakPtr()));
-  } else {
-    filters_provider_->LoadDAT(
-        base::BindOnce(&AdBlockService::SourceProviderObserver::OnDATLoaded,
-                       weak_factory_.GetWeakPtr()));
-  }
+  OnChanged();
 }
 
 AdBlockService::SourceProviderObserver::~SourceProviderObserver() {
@@ -97,24 +56,24 @@ AdBlockService::SourceProviderObserver::~SourceProviderObserver() {
 }
 
 void AdBlockService::SourceProviderObserver::OnChanged() {
+  auto filter_set = std::make_unique<rust::Box<adblock::FilterSet>>(
+      adblock::new_filter_set());
+  rust::Box<adblock::FilterSet>* filter_set_ptr = filter_set.get();
+  auto on_loaded_cb =
+      base::BindOnce(&AdBlockService::SourceProviderObserver::OnFilterSetLoaded,
+                     weak_factory_.GetWeakPtr(), std::move(filter_set));
   if (is_filter_provider_manager_) {
     static_cast<AdBlockFiltersProviderManager*>(filters_provider_.get())
-        ->LoadDATBufferForEngine(
-            adblock_engine_->IsDefaultEngine(),
-            base::BindOnce(&AdBlockService::SourceProviderObserver::OnDATLoaded,
-                           weak_factory_.GetWeakPtr()));
+        ->LoadFilterSetForEngine(adblock_engine_->IsDefaultEngine(),
+                                 filter_set_ptr, std::move(on_loaded_cb));
   } else {
-    filters_provider_->LoadDAT(
-        base::BindOnce(&AdBlockService::SourceProviderObserver::OnDATLoaded,
-                       weak_factory_.GetWeakPtr()));
+    filters_provider_->LoadFilterSet(filter_set_ptr, std::move(on_loaded_cb));
   }
 }
 
-void AdBlockService::SourceProviderObserver::OnDATLoaded(
-    bool deserialize,
-    const DATFileDataBuffer& dat_buf) {
-  deserialize_ = deserialize;
-  dat_buf_ = std::move(dat_buf);
+void AdBlockService::SourceProviderObserver::OnFilterSetLoaded(
+    std::unique_ptr<rust::Box<adblock::FilterSet>> filter_set) {
+  filter_set_ = std::move(filter_set);
   // multiple AddObserver calls are ignored
   resource_provider_->AddObserver(this);
   resource_provider_->LoadResources(base::BindOnce(
@@ -123,21 +82,21 @@ void AdBlockService::SourceProviderObserver::OnDATLoaded(
 
 void AdBlockService::SourceProviderObserver::OnResourcesLoaded(
     const std::string& resources_json) {
-  if (dat_buf_.empty()) {
+  if (!filter_set_) {
     task_runner_->PostTask(
         FROM_HERE,
         base::BindOnce(&AdBlockEngine::UseResources,
                        adblock_engine_->AsWeakPtr(), resources_json));
   } else {
     auto engine_load_callback = base::BindOnce(
-        [](base::WeakPtr<AdBlockEngine> engine, bool deserialize,
-           DATFileDataBuffer dat_buf, const std::string& resources_json) {
+        [](base::WeakPtr<AdBlockEngine> engine,
+           std::unique_ptr<rust::Box<adblock::FilterSet>> filter_set,
+           const std::string& resources_json) {
           if (engine) {
-            engine->Load(deserialize, std::move(dat_buf), resources_json);
+            engine->Load(std::move(*filter_set.get()), resources_json);
           }
         },
-        adblock_engine_->AsWeakPtr(), deserialize_, std::move(dat_buf_),
-        resources_json);
+        adblock_engine_->AsWeakPtr(), std::move(filter_set_), resources_json);
     task_runner_->PostTask(FROM_HERE, std::move(engine_load_callback));
   }
 }
@@ -264,9 +223,9 @@ base::Value::Dict AdBlockService::HiddenClassIdSelectors(
   return result;
 }
 
-AdBlockRegionalServiceManager* AdBlockService::regional_service_manager() {
+AdBlockComponentServiceManager* AdBlockService::component_service_manager() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
-  return regional_service_manager_.get();
+  return component_service_manager_.get();
 }
 
 AdBlockCustomFiltersProvider* AdBlockService::custom_filters_provider() {
@@ -321,16 +280,7 @@ AdBlockService::AdBlockService(
       std::make_unique<AdBlockFilterListCatalogProvider>(
           component_update_service_);
 
-  default_filters_provider_ = std::make_unique<AdBlockComponentFiltersProvider>(
-      component_update_service_, g_ad_block_default_component_id_,
-      g_ad_block_default_component_base64_public_key_,
-      kAdBlockDefaultComponentName);
-  default_exception_filters_provider_ =
-      std::make_unique<AdBlockComponentFiltersProvider>(
-          component_update_service_, kAdBlockExceptionComponentId,
-          kAdBlockExceptionComponentBase64PublicKey,
-          kAdBlockExceptionComponentName);
-  regional_service_manager_ = std::make_unique<AdBlockRegionalServiceManager>(
+  component_service_manager_ = std::make_unique<AdBlockComponentServiceManager>(
       local_state_, locale_, component_update_service_,
       filter_list_catalog_provider_.get());
   subscription_service_manager_ =
@@ -469,12 +419,4 @@ void AdBlockService::TagExistsForTest(const std::string& tag,
       std::move(cb));
 }
 
-// static
-void SetDefaultAdBlockComponentIdAndBase64PublicKeyForTest(
-    const std::string& component_id,
-    const std::string& component_base64_public_key) {
-  g_ad_block_default_component_id_ = component_id;
-  g_ad_block_default_component_base64_public_key_ = component_base64_public_key;
-}
-
 }  // namespace brave_shields
diff --git a/components/brave_shields/browser/ad_block_service.h b/components/brave_shields/browser/ad_block_service.h
index 4e2f79029e69..569becbd3041 100644
--- a/components/brave_shields/browser/ad_block_service.h
+++ b/components/brave_shields/browser/ad_block_service.h
@@ -44,7 +44,7 @@ namespace brave_shields {
 class AdBlockEngine;
 class AdBlockComponentFiltersProvider;
 class AdBlockDefaultResourceProvider;
-class AdBlockRegionalServiceManager;
+class AdBlockComponentServiceManager;
 class AdBlockCustomFiltersProvider;
 class AdBlockLocalhostFiltersProvider;
 class AdBlockFilterListCatalogProvider;
@@ -67,7 +67,7 @@ class AdBlockService {
     ~SourceProviderObserver() override;
 
    private:
-    void OnDATLoaded(bool deserialize, const DATFileDataBuffer& dat_buf);
+    void OnFilterSetLoaded(std::unique_ptr<rust::Box<adblock::FilterSet>>);
 
     // AdBlockFiltersProvider::Observer
     void OnChanged() override;
@@ -75,8 +75,7 @@ class AdBlockService {
     // AdBlockResourceProvider::Observer
     void OnResourcesLoaded(const std::string& resources_json) override;
 
-    bool deserialize_;
-    DATFileDataBuffer dat_buf_;
+    std::unique_ptr<rust::Box<adblock::FilterSet>> filter_set_;
     raw_ptr<AdBlockEngine> adblock_engine_;
     raw_ptr<AdBlockFiltersProvider> filters_provider_;    // not owned
     raw_ptr<AdBlockResourceProvider> resource_provider_;  // not owned
@@ -116,7 +115,7 @@ class AdBlockService {
       const std::vector<std::string>& ids,
       const std::vector<std::string>& exceptions);
 
-  AdBlockRegionalServiceManager* regional_service_manager();
+  AdBlockComponentServiceManager* component_service_manager();
   AdBlockSubscriptionServiceManager* subscription_service_manager();
   AdBlockCustomFiltersProvider* custom_filters_provider();
 
@@ -182,7 +181,7 @@ class AdBlockService {
       filter_list_catalog_provider_ GUARDED_BY_CONTEXT(sequence_checker_);
   std::unique_ptr<AdBlockSubscriptionServiceManager>
       subscription_service_manager_ GUARDED_BY_CONTEXT(sequence_checker_);
-  std::unique_ptr<AdBlockRegionalServiceManager> regional_service_manager_
+  std::unique_ptr<AdBlockComponentServiceManager> component_service_manager_
       GUARDED_BY_CONTEXT(sequence_checker_);
 
   std::unique_ptr<AdBlockEngine, base::OnTaskRunnerDeleter> default_engine_;
@@ -202,11 +201,6 @@ class AdBlockService {
 // Registers the local_state preferences used by Adblock
 void RegisterPrefsForAdBlockService(PrefRegistrySimple* registry);
 
-// static
-void SetDefaultAdBlockComponentIdAndBase64PublicKeyForTest(
-    const std::string& component_id,
-    const std::string& component_base64_public_key);
-
 }  // namespace brave_shields
 
 #endif  // BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_AD_BLOCK_SERVICE_H_
diff --git a/components/brave_shields/browser/ad_block_subscription_filters_provider.cc b/components/brave_shields/browser/ad_block_subscription_filters_provider.cc
index 67764923ec01..2fd3b71e683f 100644
--- a/components/brave_shields/browser/ad_block_subscription_filters_provider.cc
+++ b/components/brave_shields/browser/ad_block_subscription_filters_provider.cc
@@ -8,6 +8,7 @@
 #include <string>
 #include <utility>
 
+#include "base/logging.h"
 #include "base/task/thread_pool.h"
 #include "brave/components/brave_shields/adblock/rs/src/lib.rs.h"
 #include "brave/components/brave_shields/browser/ad_block_filters_provider.h"
@@ -27,14 +28,14 @@ AdBlockSubscriptionFiltersProvider::AdBlockSubscriptionFiltersProvider(
 AdBlockSubscriptionFiltersProvider::~AdBlockSubscriptionFiltersProvider() =
     default;
 
-void AdBlockSubscriptionFiltersProvider::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
+void AdBlockSubscriptionFiltersProvider::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
   base::ThreadPool::PostTaskAndReplyWithResult(
       FROM_HERE, {base::MayBlock()},
       base::BindOnce(&brave_component_updater::ReadDATFileData, list_file_),
       base::BindOnce(&AdBlockSubscriptionFiltersProvider::OnDATFileDataReady,
-                     weak_factory_.GetWeakPtr(), std::move(cb)));
+                     weak_factory_.GetWeakPtr(), std::move(cb), filter_set));
 }
 
 std::string AdBlockSubscriptionFiltersProvider::GetNameForDebugging() {
@@ -42,12 +43,17 @@ std::string AdBlockSubscriptionFiltersProvider::GetNameForDebugging() {
 }
 
 void AdBlockSubscriptionFiltersProvider::OnDATFileDataReady(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb,
+    base::OnceCallback<void()> cb,
+    rust::Box<adblock::FilterSet>* filter_set,
     const DATFileDataBuffer& dat_buf) {
-  auto metadata = adblock::read_list_metadata(dat_buf);
-  on_metadata_retrieved_.Run(metadata);
-  std::move(cb).Run(false, dat_buf);
+  auto result = (*filter_set)->add_filter_list(dat_buf);
+  if (result.result_kind == adblock::ResultKind::Success) {
+    on_metadata_retrieved_.Run(result.value);
+  } else {
+    VLOG(0) << "Subscription list parsing failed: "
+            << result.error_message.c_str();
+  }
+  std::move(cb).Run();
 }
 
 void AdBlockSubscriptionFiltersProvider::OnListAvailable() {
diff --git a/components/brave_shields/browser/ad_block_subscription_filters_provider.h b/components/brave_shields/browser/ad_block_subscription_filters_provider.h
index 5a5f4d0dffc1..5e03aa1d186b 100644
--- a/components/brave_shields/browser/ad_block_subscription_filters_provider.h
+++ b/components/brave_shields/browser/ad_block_subscription_filters_provider.h
@@ -36,14 +36,12 @@ class AdBlockSubscriptionFiltersProvider : public AdBlockFiltersProvider {
       const AdBlockSubscriptionFiltersProvider&) = delete;
   ~AdBlockSubscriptionFiltersProvider() override;
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)>) override;
-
-  void OnDATFileDataReady(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)> cb,
-      const DATFileDataBuffer& dat_buf);
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
+
+  void OnDATFileDataReady(base::OnceCallback<void()> cb,
+                          rust::Box<adblock::FilterSet>* filter_set,
+                          const DATFileDataBuffer& dat_buf);
 
   void OnListAvailable();
 
diff --git a/components/brave_shields/browser/cookie_list_opt_in_service.cc b/components/brave_shields/browser/cookie_list_opt_in_service.cc
index 17468880b726..59fbc7749762 100644
--- a/components/brave_shields/browser/cookie_list_opt_in_service.cc
+++ b/components/brave_shields/browser/cookie_list_opt_in_service.cc
@@ -9,7 +9,7 @@
 
 #include "base/feature_list.h"
 #include "base/metrics/histogram_functions.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 #include "brave/components/brave_shields/common/cookie_list_opt_in.mojom-forward.h"
diff --git a/components/brave_shields/browser/filter_list_catalog_entry.cc b/components/brave_shields/browser/filter_list_catalog_entry.cc
index 65e675a8793b..86b69515c951 100644
--- a/components/brave_shields/browser/filter_list_catalog_entry.cc
+++ b/components/brave_shields/browser/filter_list_catalog_entry.cc
@@ -13,6 +13,7 @@
 #include "base/json/json_reader.h"
 #include "base/json/json_value_converter.h"
 #include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/ranges/algorithm.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
@@ -70,6 +71,20 @@ bool GetStringVector(const base::Value* value,
   }
 }
 
+bool GetUint8(const base::Value* value, uint8_t* field) {
+  DCHECK(field);
+  if (value == nullptr || !value->is_int()) {
+    return false;
+  } else {
+    int i = value->GetInt();
+    if (!base::IsValueInRangeForNumericType<uint8_t>(i)) {
+      return false;
+    }
+    *field = base::checked_cast<uint8_t>(i);
+    return true;
+  }
+}
+
 }  // namespace
 
 namespace brave_shields {
@@ -82,9 +97,13 @@ FilterListCatalogEntry::FilterListCatalogEntry(
     const std::string& title,
     const std::vector<std::string>& langs,
     const std::string& support_url,
+    const std::string& desc,
+    bool hidden,
+    bool default_enabled,
+    bool first_party_protections,
+    uint8_t permission_mask,
     const std::string& component_id,
     const std::string& base64_public_key,
-    const std::string& desc,
     const std::string& ios_component_id,
     const std::string& ios_base64_public_key)
     : uuid(uuid),
@@ -92,9 +111,13 @@ FilterListCatalogEntry::FilterListCatalogEntry(
       title(title),
       langs(langs),
       support_url(support_url),
+      desc(desc),
+      hidden(hidden),
+      default_enabled(default_enabled),
+      first_party_protections(first_party_protections),
+      permission_mask(permission_mask),
       component_id(component_id),
       base64_public_key(base64_public_key),
-      desc(desc),
       ios_component_id(ios_component_id),
       ios_base64_public_key(ios_base64_public_key) {}
 
@@ -112,13 +135,21 @@ void FilterListCatalogEntry::RegisterJSONConverter(
       "langs", &FilterListCatalogEntry::langs, &GetStringVector);
   converter->RegisterStringField("support_url",
                                  &FilterListCatalogEntry::support_url);
+  converter->RegisterStringField("desc", &FilterListCatalogEntry::desc);
+  converter->RegisterBoolField("hidden", &FilterListCatalogEntry::hidden);
+  converter->RegisterBoolField("default_enabled",
+                               &FilterListCatalogEntry::default_enabled);
+  converter->RegisterBoolField(
+      "first_party_protections",
+      &FilterListCatalogEntry::first_party_protections);
+  converter->RegisterCustomValueField(
+      "permission_mask", &FilterListCatalogEntry::permission_mask, &GetUint8);
   converter->RegisterCustomValueField("list_text_component",
                                       &FilterListCatalogEntry::component_id,
                                       &GetComponentId);
   converter->RegisterCustomValueField(
       "list_text_component", &FilterListCatalogEntry::base64_public_key,
       &GetBase64PublicKey);
-  converter->RegisterStringField("desc", &FilterListCatalogEntry::desc);
   converter->RegisterStringField("component_id",
                                  &FilterListCatalogEntry::ios_component_id);
   converter->RegisterStringField(
@@ -128,9 +159,7 @@ void FilterListCatalogEntry::RegisterJSONConverter(
 std::vector<FilterListCatalogEntry>::const_iterator FindAdBlockFilterListByUUID(
     const std::vector<FilterListCatalogEntry>& region_lists,
     const std::string& uuid) {
-  std::string uuid_uppercase = base::ToUpperASCII(uuid);
-  return base::ranges::find(region_lists, uuid_uppercase,
-                            &FilterListCatalogEntry::uuid);
+  return base::ranges::find(region_lists, uuid, &FilterListCatalogEntry::uuid);
 }
 
 // Given a locale like `en-US`, find regional lists corresponding to the
diff --git a/components/brave_shields/browser/filter_list_catalog_entry.h b/components/brave_shields/browser/filter_list_catalog_entry.h
index 807449a00d3d..8f7bc9e2e206 100644
--- a/components/brave_shields/browser/filter_list_catalog_entry.h
+++ b/components/brave_shields/browser/filter_list_catalog_entry.h
@@ -19,7 +19,9 @@ namespace brave_shields {
 
 // Represents an entry of the catalog of filter lists that Brave makes
 // available. Corresponds to the entries in
-// https://github.com/brave/adblock-resources/blob/master/filter_lists/regional.json
+// https://github.com/brave/adblock-resources/blob/master/filter_lists/regional.json.
+// See https://github.com/brave/adblock-resources#filter-list-description-format
+// for details.
 class FilterListCatalogEntry {
  public:
   FilterListCatalogEntry();
@@ -28,9 +30,13 @@ class FilterListCatalogEntry {
                          const std::string& title,
                          const std::vector<std::string>& langs,
                          const std::string& support_url,
+                         const std::string& desc,
+                         bool hidden,
+                         bool default_enabled,
+                         bool first_party_protections,
+                         uint8_t permission_mask,
                          const std::string& component_id,
                          const std::string& base64_public_key,
-                         const std::string& desc,
                          const std::string& ios_component_id,
                          const std::string& ios_base64_public_key);
   explicit FilterListCatalogEntry(const FilterListCatalogEntry& other);
@@ -41,9 +47,16 @@ class FilterListCatalogEntry {
   std::string title;
   std::vector<std::string> langs;
   std::string support_url;
+  std::string desc;
+
+  // Optional fields with default values
+  bool hidden = false;
+  bool default_enabled = false;
+  bool first_party_protections = false;
+  uint8_t permission_mask = 0;
+
   std::string component_id;
   std::string base64_public_key;
-  std::string desc;
   std::string ios_component_id;
   std::string ios_base64_public_key;
 
diff --git a/components/brave_shields/browser/filter_list_service.cc b/components/brave_shields/browser/filter_list_service.cc
index a097504b83eb..9cc44715624c 100644
--- a/components/brave_shields/browser/filter_list_service.cc
+++ b/components/brave_shields/browser/filter_list_service.cc
@@ -10,8 +10,8 @@
 #include <string>
 #include "base/feature_list.h"
 #include "base/strings/utf_string_conversions.h"
+#include "brave/components/brave_shields/browser/ad_block_component_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_custom_filters_provider.h"
-#include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
 #include "brave/components/brave_shields/common/features.h"
@@ -44,19 +44,19 @@ void FilterListService::IsFilterListEnabled(
     const std::string& filterListUuid,
     IsFilterListEnabledCallback callback) {
   std::move(callback).Run(
-      ad_block_service_->regional_service_manager()->IsFilterListEnabled(
+      ad_block_service_->component_service_manager()->IsFilterListEnabled(
           filterListUuid));
 }
 
 void FilterListService::EnableFilter(const std::string& filterListUuid,
                                      bool shouldEnableFilter) {
-  ad_block_service_->regional_service_manager()->EnableFilterList(
+  ad_block_service_->component_service_manager()->EnableFilterList(
       filterListUuid, shouldEnableFilter);
 }
 
 void FilterListService::GetFilterLists(GetFilterListsCallback callback) {
   std::move(callback).Run(
-      ad_block_service_->regional_service_manager()->GetRegionalLists());
+      ad_block_service_->component_service_manager()->GetRegionalLists());
 }
 
 void FilterListService::GetSubscriptions(GetSubscriptionsCallback callback) {
diff --git a/components/brave_shields/browser/test_filters_provider.cc b/components/brave_shields/browser/test_filters_provider.cc
index 06983850a958..a72c9474c32e 100644
--- a/components/brave_shields/browser/test_filters_provider.cc
+++ b/components/brave_shields/browser/test_filters_provider.cc
@@ -15,16 +15,14 @@ namespace brave_shields {
 TestFiltersProvider::TestFiltersProvider(const std::string& rules,
                                          const std::string& resources)
     : AdBlockFiltersProvider(true), rules_(rules), resources_(resources) {}
-
-TestFiltersProvider::TestFiltersProvider(const base::FilePath& dat_location,
-                                         const std::string& resources)
-    : AdBlockFiltersProvider(true), resources_(resources) {
-  CHECK(!dat_location.empty());
-
-  dat_buffer_ = brave_component_updater::ReadDATFileData(dat_location);
-
-  CHECK(!dat_buffer_.empty());
-}
+TestFiltersProvider::TestFiltersProvider(const std::string& rules,
+                                         const std::string& resources,
+                                         bool engine_is_default,
+                                         uint8_t permission_mask)
+    : AdBlockFiltersProvider(engine_is_default),
+      rules_(rules),
+      resources_(resources),
+      permission_mask_(permission_mask) {}
 
 TestFiltersProvider::~TestFiltersProvider() = default;
 
@@ -32,15 +30,12 @@ std::string TestFiltersProvider::GetNameForDebugging() {
   return "TestFiltersProvider";
 }
 
-void TestFiltersProvider::LoadDATBuffer(
-    base::OnceCallback<void(bool deserialize, const DATFileDataBuffer& dat_buf)>
-        cb) {
-  if (dat_buffer_.empty()) {
-    auto buffer = std::vector<unsigned char>(rules_.begin(), rules_.end());
-    std::move(cb).Run(false, buffer);
-  } else {
-    std::move(cb).Run(true, dat_buffer_);
-  }
+void TestFiltersProvider::LoadFilterSet(
+    rust::Box<adblock::FilterSet>* filter_set,
+    base::OnceCallback<void()> cb) {
+  auto buffer = std::vector<unsigned char>(rules_.begin(), rules_.end());
+  (*filter_set)->add_filter_list_with_permissions(buffer, permission_mask_);
+  std::move(cb).Run();
 }
 
 void TestFiltersProvider::LoadResources(
diff --git a/components/brave_shields/browser/test_filters_provider.h b/components/brave_shields/browser/test_filters_provider.h
index 3fe19edf00bb..04ac4778262b 100644
--- a/components/brave_shields/browser/test_filters_provider.h
+++ b/components/brave_shields/browser/test_filters_provider.h
@@ -9,7 +9,6 @@
 #include <string>
 #include <vector>
 
-#include "base/files/file_path.h"
 #include "base/functional/callback.h"
 #include "brave/components/brave_component_updater/browser/dat_file_util.h"
 #include "brave/components/brave_shields/browser/ad_block_filters_provider.h"
@@ -23,13 +22,14 @@ class TestFiltersProvider : public AdBlockFiltersProvider,
                             public AdBlockResourceProvider {
  public:
   TestFiltersProvider(const std::string& rules, const std::string& resources);
-  TestFiltersProvider(const base::FilePath& dat_location,
-                      const std::string& resources);
+  TestFiltersProvider(const std::string& rules,
+                      const std::string& resources,
+                      bool engine_is_default,
+                      uint8_t permission_mask = 0);
   ~TestFiltersProvider() override;
 
-  void LoadDATBuffer(
-      base::OnceCallback<void(bool deserialize,
-                              const DATFileDataBuffer& dat_buf)> cb) override;
+  void LoadFilterSet(rust::Box<adblock::FilterSet>* filter_set,
+                     base::OnceCallback<void()>) override;
 
   void LoadResources(
       base::OnceCallback<void(const std::string& resources_json)> cb) override;
@@ -37,9 +37,9 @@ class TestFiltersProvider : public AdBlockFiltersProvider,
   std::string GetNameForDebugging() override;
 
  private:
-  DATFileDataBuffer dat_buffer_;
   std::string rules_;
   std::string resources_;
+  uint8_t permission_mask_;
 };
 
 }  // namespace brave_shields
diff --git a/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.h b/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.h
index 74de4ddd48bb..71d74ab721a7 100644
--- a/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.h
+++ b/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.h
@@ -17,9 +17,13 @@ OBJC_EXPORT
 @property(readonly) NSString* title;
 @property(readonly) NSArray<NSString*>* languages;
 @property(readonly) NSString* supportURL;
+@property(readonly) NSString* desc;
+@property(readonly) bool hidden;
+@property(readonly) bool defaultEnabled;
+@property(readonly) bool firstPartyProtections;
+@property(readonly) uint8_t permissionMask;
 @property(readonly) NSString* componentId;
 @property(readonly) NSString* base64PublicKey;
-@property(readonly) NSString* desc;
 @property(readonly) NSString* iosComponentId;
 @property(readonly) NSString* iosBase64PublicKey;
 - (instancetype)init NS_UNAVAILABLE;
diff --git a/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.mm b/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.mm
index 37dff599608c..ddba168099e4 100644
--- a/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.mm
+++ b/ios/browser/api/brave_shields/adblock_filter_list_catalog_entry.mm
@@ -15,9 +15,13 @@ @interface AdblockFilterListCatalogEntry ()
 @property(nonatomic, copy) NSString* title;
 @property(nonatomic, copy) NSArray<NSString*>* languages;
 @property(nonatomic, copy) NSString* supportURL;
+@property(nonatomic, copy) NSString* desc;
+@property(nonatomic) bool hidden;
+@property(nonatomic) bool defaultEnabled;
+@property(nonatomic) bool firstPartyProtections;
+@property(nonatomic) uint8_t permissionMask;
 @property(nonatomic, copy) NSString* componentId;
 @property(nonatomic, copy) NSString* base64PublicKey;
-@property(nonatomic, copy) NSString* desc;
 @property(nonatomic, copy) NSString* iosComponentId;
 @property(nonatomic, copy) NSString* iosBase64PublicKey;
 @end
@@ -32,9 +36,13 @@ - (instancetype)initWithFilterListCatalogEntry:
     self.title = base::SysUTF8ToNSString(entry.title);
     self.languages = brave::vector_to_ns<std::string>(entry.langs);
     self.supportURL = base::SysUTF8ToNSString(entry.support_url);
+    self.desc = base::SysUTF8ToNSString(entry.desc);
+    self.hidden = entry.hidden;
+    self.defaultEnabled = entry.default_enabled;
+    self.firstPartyProtections = entry.first_party_protections;
+    self.permissionMask = entry.permission_mask;
     self.componentId = base::SysUTF8ToNSString(entry.component_id);
     self.base64PublicKey = base::SysUTF8ToNSString(entry.base64_public_key);
-    self.desc = base::SysUTF8ToNSString(entry.desc);
     self.iosComponentId = base::SysUTF8ToNSString(entry.ios_component_id);
     self.iosBase64PublicKey =
         base::SysUTF8ToNSString(entry.ios_base64_public_key);
@@ -48,9 +56,10 @@ - (instancetype)initWithFilterListCatalogEntry:
       base::SysNSStringToUTF8(self.title),
       brave::ns_to_vector<std::string>(self.languages),
       base::SysNSStringToUTF8(self.supportURL),
+      base::SysNSStringToUTF8(self.desc), self.hidden, self.defaultEnabled,
+      self.firstPartyProtections, self.permissionMask,
       base::SysNSStringToUTF8(self.componentId),
       base::SysNSStringToUTF8(self.base64PublicKey),
-      base::SysNSStringToUTF8(self.desc),
       base::SysNSStringToUTF8(self.iosComponentId),
       base::SysNSStringToUTF8(self.iosBase64PublicKey));
 }
diff --git a/test/BUILD.gn b/test/BUILD.gn
index bb1ed2a495ae..9dd97be6b8c7 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -129,7 +129,7 @@ test("brave_unit_tests") {
     "//brave/components/brave_private_cdn/private_cdn_helper_unittest.cc",
     "//brave/components/brave_search/browser/brave_search_default_host_unittest.cc",
     "//brave/components/brave_search/browser/brave_search_fallback_host_unittest.cc",
-    "//brave/components/brave_shields/browser/ad_block_regional_service_unittest.cc",
+    "//brave/components/brave_shields/browser/ad_block_component_service_unittest.cc",
     "//brave/components/brave_shields/browser/adblock_stub_response_unittest.cc",
     "//brave/components/brave_shields/browser/brave_farbling_service_unittest.cc",
     "//brave/components/brave_shields/browser/cookie_list_opt_in_service_unittest.cc",
diff --git a/test/data/adblock-data/redirect-rule.dat b/test/data/adblock-data/redirect-rule.dat
deleted file mode 100644
index 6caa28b8f22f..000000000000
Binary files a/test/data/adblock-data/redirect-rule.dat and /dev/null differ