diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 0e08052..794c552 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -9,8 +9,9 @@
   "mounts": [
     "source=${localWorkspaceFolder},target=/config/www/workspace,type=bind",
     "source=${localWorkspaceFolder}/test,target=/config/test,type=bind",
+    "source=${localWorkspaceFolder}/test,target=/config/www/test,type=bind",
     "source=${localWorkspaceFolder}/test/configuration.yaml,target=/config/configuration.yaml,type=bind",
-    "source=${localWorkspaceFolder}/custom_components,target=/config/custom_components,type=bind"
+    "source=${localWorkspaceFolder}/custom_components/favicon,target=/config/custom_components/favicon,type=bind"
   ],
   "runArgs": ["--env-file", "${localWorkspaceFolder}/test/.env"],
   "extensions": [
diff --git a/custom_components/favicon/__init__.py b/custom_components/favicon/__init__.py
index 87d271a..9da17ed 100644
--- a/custom_components/favicon/__init__.py
+++ b/custom_components/favicon/__init__.py
@@ -158,15 +158,17 @@ def new_render(*args, **kwargs):
         if isinstance(view, frontend.IndexView):
             view._template_cache = None
 
-    frontend.MANIFEST_JSON["icons"] = data["manifest_icons"].copy()
     if "manifest" in icons:
-        frontend.MANIFEST_JSON["icons"] = icons["manifest"]
+        frontend.add_manifest_json_key("icons", icons["manifest"])
+    else:
+        frontend.add_manifest_json_key("icons", data["manifest_icons"].copy())
 
-    frontend.MANIFEST_JSON["name"] = "Home Assistant"
-    frontend.MANIFEST_JSON["short_name"] = "Assistant"
     if title:
-        frontend.MANIFEST_JSON["name"] = title
-        frontend.MANIFEST_JSON["short_name"] = title
+        frontend.add_manifest_json_key("name", title)
+        frontend.add_manifest_json_key("short_name", title)
+    else:
+        frontend.add_manifest_json_key("name", "Home Assistant")
+        frontend.add_manifest_json_key("short_name", "Assistant")
 
     return True
 
@@ -174,7 +176,7 @@ def new_render(*args, **kwargs):
 def remove_hooks(hass):
     data = hass.data[DOMAIN]
     frontend.IndexView.get_template = data["get_template"]
-    frontend.MANIFEST_JSON["icons"] = data["manifest_icons"].copy()
-    frontend.MANIFEST_JSON["name"] = "Home Assistant"
-    frontend.MANIFEST_JSON["short_name"] = "Assistant"
+    frontend.add_manifest_json_key("icons", data["manifest_icons"].copy())
+    frontend.add_manifest_json_key("name", "Home Assistant")
+    frontend.add_manifest_json_key("short_name", "Assistant")
     return True
diff --git a/custom_components/favicon/manifest.json b/custom_components/favicon/manifest.json
index ceecf51..da8e6f7 100644
--- a/custom_components/favicon/manifest.json
+++ b/custom_components/favicon/manifest.json
@@ -6,5 +6,5 @@
   "codeowners": [],
   "requirements": [],
   "config_flow": true,
-  "version": "10.3"
+  "version": "10.4"
 }
diff --git a/test/configuration.yaml b/test/configuration.yaml
index dc1f897..5a2f22c 100644
--- a/test/configuration.yaml
+++ b/test/configuration.yaml
@@ -2,6 +2,5 @@ default_config:
 
 demo:
 
-
 favicon:
   title: Test title