diff --git a/src/extension-support/extension-worker.js b/src/extension-support/extension-worker.js
index b0a9b89522..bdc5286a25 100644
--- a/src/extension-support/extension-worker.js
+++ b/src/extension-support/extension-worker.js
@@ -1,6 +1,7 @@
 /* eslint-env worker */
 
 const ScratchCommon = require('./tw-extension-api-common');
+const createScratchX = require('./tw-scratchx-compatibility-layer');
 const dispatch = require('../dispatch/worker-dispatch');
 const log = require('../util/log');
 const {isWorker} = require('./tw-extension-worker-context');
@@ -95,4 +96,4 @@ global.Scratch.extensions = {
     register: extensionWorker.register.bind(extensionWorker)
 };
 
-global.ScratchExtensions = require('./tw-scratchx-compatibility-layer');
+global.ScratchExtensions = createScratchX(global.Scratch);
diff --git a/src/extension-support/tw-scratchx-compatibility-layer.js b/src/extension-support/tw-scratchx-compatibility-layer.js
index 227af2b52a..bceae527aa 100644
--- a/src/extension-support/tw-scratchx-compatibility-layer.js
+++ b/src/extension-support/tw-scratchx-compatibility-layer.js
@@ -1,8 +1,5 @@
 // ScratchX API Documentation: https://github.com/LLK/scratchx/wiki/
 
-// Global Scratch API from extension-worker.js
-/* globals Scratch */
-
 const ArgumentType = require('./argument-type');
 const BlockType = require('./block-type');
 
@@ -191,31 +188,36 @@ const convert = (name, descriptor, functions) => {
 
 const extensionNameToExtension = new Map();
 
-const register = (name, descriptor, functions) => {
-    const scratch3Extension = convert(name, descriptor, functions);
-    extensionNameToExtension.set(name, scratch3Extension);
-    Scratch.extensions.register(scratch3Extension);
-};
-
 /**
- * @param {string} extensionName
- * @returns {ScratchXStatus}
+ * @param {*} Scratch Scratch 3.0 extension API object
+ * @returns {*} ScratchX-compatible API object
  */
-const getStatus = extensionName => {
-    const extension = extensionNameToExtension.get(extensionName);
-    if (extension) {
-        return extension._getStatus();
-    }
-    return {
-        status: 0,
-        msg: 'does not exist'
+const createScratchX = Scratch => {
+    const register = (name, descriptor, functions) => {
+        const scratch3Extension = convert(name, descriptor, functions);
+        extensionNameToExtension.set(name, scratch3Extension);
+        Scratch.extensions.register(scratch3Extension);
     };
-};
 
-module.exports = {
-    register,
-    getStatus,
+    /**
+     * @param {string} extensionName
+     * @returns {ScratchXStatus}
+     */
+    const getStatus = extensionName => {
+        const extension = extensionNameToExtension.get(extensionName);
+        if (extension) {
+            return extension._getStatus();
+        }
+        return {
+            status: 0,
+            msg: 'does not exist'
+        };
+    };
 
-    // For tests
-    convert
+    return {
+        register,
+        getStatus
+    };
 };
+
+module.exports = createScratchX;
diff --git a/src/extension-support/tw-unsandboxed-extension-runner.js b/src/extension-support/tw-unsandboxed-extension-runner.js
index c249b8ced5..ec68264613 100644
--- a/src/extension-support/tw-unsandboxed-extension-runner.js
+++ b/src/extension-support/tw-unsandboxed-extension-runner.js
@@ -1,4 +1,5 @@
 const ScratchCommon = require('./tw-extension-api-common');
+const createScratchX = require('./tw-scratchx-compatibility-layer');
 const AsyncLimiter = require('../util/async-limiter');
 const createTranslate = require('./tw-l10n');
 
@@ -16,19 +17,18 @@ const parseURL = url => {
 };
 
 /**
- * Sets up the global.Scratch API for an unsandboxed extension.
+ * Create the unsandboxed extension API objects.
  * @param {VirtualMachine} vm
- * @returns {Promise<object[]>} Resolves with a list of extension objects when Scratch.extensions.register is called.
+ * @returns {*} The objects
  */
-const setupUnsandboxedExtensionAPI = vm => new Promise(resolve => {
-    const extensionObjects = [];
-    const register = extensionObject => {
-        extensionObjects.push(extensionObject);
-        resolve(extensionObjects);
+const createAPI = vm => {
+    const extensions = [];
+    const register = extension => {
+        extensions.push(extension);
     };
 
-    // Create a new copy of global.Scratch for each extension
-    const Scratch = Object.assign({}, global.Scratch || {}, ScratchCommon);
+    // Each extension should get its own copy of Scratch so they don't break things badly
+    const Scratch = Object.assign({}, global.Scratch, ScratchCommon);
     Scratch.extensions = {
         unsandboxed: true,
         register
@@ -114,18 +114,12 @@ const setupUnsandboxedExtensionAPI = vm => new Promise(resolve => {
 
     Scratch.translate = createTranslate(vm);
 
-    global.Scratch = Scratch;
-    global.ScratchExtensions = require('./tw-scratchx-compatibility-layer');
-});
+    const ScratchExtensions = createScratchX(Scratch);
 
-/**
- * Disable the existing global.Scratch unsandboxed extension APIs.
- * This helps debug poorly designed extensions.
- */
-const teardownUnsandboxedExtensionAPI = () => {
-    // We can assume global.Scratch already exists.
-    global.Scratch.extensions.register = () => {
-        throw new Error('Too late to register new extensions.');
+    return {
+        Scratch,
+        ScratchExtensions,
+        extensions
     };
 };
 
@@ -135,26 +129,34 @@ const teardownUnsandboxedExtensionAPI = () => {
  * @param {Virtualmachine} vm
  * @returns {Promise<object[]>} Resolves with a list of extension objects if the extension was loaded successfully.
  */
-const loadUnsandboxedExtension = (extensionURL, vm) => new Promise((resolve, reject) => {
-    setupUnsandboxedExtensionAPI(vm).then(resolve);
+const loadUnsandboxedExtension = async (extensionURL, vm) => {
+    const res = await fetch(extensionURL);
+    if (!res.ok) {
+        throw new Error(`HTTP status ${extensionURL}`);
+    }
 
-    const script = document.createElement('script');
-    script.onerror = () => {
-        reject(new Error(`Error in unsandboxed script ${extensionURL}. Check the console for more information.`));
-    };
-    script.src = extensionURL;
-    document.body.appendChild(script);
-}).then(objects => {
-    teardownUnsandboxedExtensionAPI();
-    return objects;
-});
-
-// Because loading unsandboxed extensions requires messing with global state (global.Scratch),
-// only let one extension load at a time.
+    const text = await res.text();
+
+    // AsyncFunction isn't a global like Function, but we can still access it indirectly like this
+    const AsyncFunction = (async () => {}).constructor;
+
+    const api = createAPI(vm);
+    const fn = new AsyncFunction('Scratch', 'ScratchExtensions', text);
+    await fn(api.Scratch, api.ScratchExtensions);
+
+    if (api.extensions.length === 0) {
+        throw new Error('Extension called register() 0 times');
+    }
+    return api.extensions;
+};
+
+// For now we force them to load one at a time to ensure consistent order
 const limiter = new AsyncLimiter(loadUnsandboxedExtension, 1);
 const load = (extensionURL, vm) => limiter.do(extensionURL, vm);
 
 module.exports = {
-    setupUnsandboxedExtensionAPI,
-    load
+    load,
+
+    // For tests:
+    createAPI
 };
diff --git a/test/integration/tw_privacy.js b/test/integration/tw_privacy.js
index fda382f711..f8695d49a3 100644
--- a/test/integration/tw_privacy.js
+++ b/test/integration/tw_privacy.js
@@ -94,23 +94,13 @@ test('custom extensions', async t => {
     vm.attachRenderer(mockRenderer());
 
     vm.extensionManager.securityManager.getSandboxMode = () => 'unsandboxed';
-    global.document = {
-        createElement: () => {
-            const element = {};
-            setTimeout(() => {
-                global.Scratch.extensions.register({
-                    getInfo: () => ({})
-                });
-            });
-            return element;
-        },
-        body: {
-            appendChild: () => {}
-        }
-    };
+    global.fetch = () => Promise.resolve({
+        ok: true,
+        text: () => Promise.resolve('Scratch.extensions.register({getInfo: () => ({id: "test", blocks: []})})')
+    });
 
     t.equal(vm.renderer.privateSkinAccess, true);
-    await vm.extensionManager.loadExtensionURL('data:application/javascript;,');
+    await vm.extensionManager.loadExtensionURL('data:application/javascript;,fake URL see fetch() mock');
     t.equal(vm.renderer.privateSkinAccess, false);
     t.end();
 });
diff --git a/test/integration/tw_security_manager.js b/test/integration/tw_security_manager.js
index cae95d25a3..9286a91c9c 100644
--- a/test/integration/tw_security_manager.js
+++ b/test/integration/tw_security_manager.js
@@ -2,7 +2,7 @@ const {test} = require('tap');
 const fs = require('fs');
 const path = require('path');
 const VirtualMachine = require('../../src/virtual-machine');
-const {setupUnsandboxedExtensionAPI} = require('../../src/extension-support/tw-unsandboxed-extension-runner');
+const {createAPI} = require('../../src/extension-support/tw-unsandboxed-extension-runner');
 
 const testProject = fs.readFileSync(path.join(__dirname, '..', 'fixtures', 'tw-project-with-extensions.sb3'));
 
@@ -67,49 +67,49 @@ test('Allow both extensions', async t => {
 
 test('canFetch', async t => {
     const vm = new VirtualMachine();
-    setupUnsandboxedExtensionAPI(vm);
+    const api = createAPI(vm);
     global.location = {
         href: 'https://example.com/'
     };
 
     // data: and blob: are always allowed, shouldn't call security manager
     vm.securityManager.canFetch = () => t.fail('security manager should be ignored for these protocols');
-    t.equal(await global.Scratch.canFetch('data:text/html,test'), true);
-    t.equal(await global.Scratch.canFetch('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
+    t.equal(await api.Scratch.canFetch('data:text/html,test'), true);
+    t.equal(await api.Scratch.canFetch('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
 
     vm.securityManager.canFetch = () => false;
-    t.equal(await global.Scratch.canFetch('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canFetch('http://example.com/'), false);
-    t.equal(await global.Scratch.canFetch('https://example.com/'), false);
-    t.equal(await global.Scratch.canFetch('null'), false);
-    t.equal(await global.Scratch.canFetch(null), false);
+    t.equal(await api.Scratch.canFetch('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canFetch('http://example.com/'), false);
+    t.equal(await api.Scratch.canFetch('https://example.com/'), false);
+    t.equal(await api.Scratch.canFetch('null'), false);
+    t.equal(await api.Scratch.canFetch(null), false);
 
     vm.securityManager.canFetch = () => Promise.resolve(false);
-    t.equal(await global.Scratch.canFetch('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canFetch('http://example.com/'), false);
-    t.equal(await global.Scratch.canFetch('https://example.com/'), false);
-    t.equal(await global.Scratch.canFetch('boring.html'), false);
-    t.equal(await global.Scratch.canFetch('null'), false);
-    t.equal(await global.Scratch.canFetch(null), false);
+    t.equal(await api.Scratch.canFetch('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canFetch('http://example.com/'), false);
+    t.equal(await api.Scratch.canFetch('https://example.com/'), false);
+    t.equal(await api.Scratch.canFetch('boring.html'), false);
+    t.equal(await api.Scratch.canFetch('null'), false);
+    t.equal(await api.Scratch.canFetch(null), false);
 
     vm.securityManager.canFetch = () => true;
-    t.equal(await global.Scratch.canFetch('file:///etc/hosts'), true);
-    t.equal(await global.Scratch.canFetch('http://example.com/'), true);
-    t.equal(await global.Scratch.canFetch('https://example.com/'), true);
-    t.equal(await global.Scratch.canFetch('boring.html'), true);
-    t.equal(await global.Scratch.canFetch('null'), true);
-    t.equal(await global.Scratch.canFetch(null), true);
+    t.equal(await api.Scratch.canFetch('file:///etc/hosts'), true);
+    t.equal(await api.Scratch.canFetch('http://example.com/'), true);
+    t.equal(await api.Scratch.canFetch('https://example.com/'), true);
+    t.equal(await api.Scratch.canFetch('boring.html'), true);
+    t.equal(await api.Scratch.canFetch('null'), true);
+    t.equal(await api.Scratch.canFetch(null), true);
 
     const calledWithURLs = [];
     vm.securityManager.canFetch = async url => {
         calledWithURLs.push(url);
         return url === 'https://example.com/null';
     };
-    t.equal(await global.Scratch.canFetch('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canFetch('http://example.com/'), false);
-    t.equal(await global.Scratch.canFetch('https://example.com/null'), true);
-    t.equal(await global.Scratch.canFetch('null'), true);
-    t.equal(await global.Scratch.canFetch(null), true);
+    t.equal(await api.Scratch.canFetch('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canFetch('http://example.com/'), false);
+    t.equal(await api.Scratch.canFetch('https://example.com/null'), true);
+    t.equal(await api.Scratch.canFetch('null'), true);
+    t.equal(await api.Scratch.canFetch(null), true);
     t.same(calledWithURLs, [
         'file:///etc/hosts',
         'http://example.com/',
@@ -123,50 +123,50 @@ test('canFetch', async t => {
 
 test('canOpenWindow', async t => {
     const vm = new VirtualMachine();
-    setupUnsandboxedExtensionAPI(vm);
+    const api = createAPI(vm);
     global.location = {
         href: 'https://example.com/'
     };
 
     // javascript: should never be allowed, shouldn't call security manager
     vm.securityManager.canOpenWindow = () => t.fail('should not call security manager for javascript:');
-    t.equal(await global.Scratch.canOpenWindow('javascript:alert(1)'), false);
+    t.equal(await api.Scratch.canOpenWindow('javascript:alert(1)'), false);
     
     vm.securityManager.canOpenWindow = () => false;
-    t.equal(await global.Scratch.canOpenWindow('data:text/html,test'), false);
-    t.equal(await global.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canOpenWindow('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canOpenWindow('https://example.com/'), false);
-    t.equal(await global.Scratch.canOpenWindow('index.html'), false);
-    t.equal(await global.Scratch.canOpenWindow(null), false);
+    t.equal(await api.Scratch.canOpenWindow('data:text/html,test'), false);
+    t.equal(await api.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canOpenWindow('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canOpenWindow('https://example.com/'), false);
+    t.equal(await api.Scratch.canOpenWindow('index.html'), false);
+    t.equal(await api.Scratch.canOpenWindow(null), false);
 
     vm.securityManager.canOpenWindow = () => Promise.resolve(false);
-    t.equal(await global.Scratch.canOpenWindow('data:text/html,test'), false);
-    t.equal(await global.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canOpenWindow('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canOpenWindow('https://example.com/'), false);
-    t.equal(await global.Scratch.canOpenWindow('index.html'), false);
-    t.equal(await global.Scratch.canOpenWindow(null), false);
+    t.equal(await api.Scratch.canOpenWindow('data:text/html,test'), false);
+    t.equal(await api.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canOpenWindow('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canOpenWindow('https://example.com/'), false);
+    t.equal(await api.Scratch.canOpenWindow('index.html'), false);
+    t.equal(await api.Scratch.canOpenWindow(null), false);
 
     vm.securityManager.canOpenWindow = () => true;
-    t.equal(await global.Scratch.canOpenWindow('data:text/html,test'), true);
-    t.equal(await global.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
-    t.equal(await global.Scratch.canOpenWindow('file:///etc/hosts'), true);
-    t.equal(await global.Scratch.canOpenWindow('https://example.com/'), true);
-    t.equal(await global.Scratch.canOpenWindow('index.html'), true);
-    t.equal(await global.Scratch.canOpenWindow(null), true);
+    t.equal(await api.Scratch.canOpenWindow('data:text/html,test'), true);
+    t.equal(await api.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
+    t.equal(await api.Scratch.canOpenWindow('file:///etc/hosts'), true);
+    t.equal(await api.Scratch.canOpenWindow('https://example.com/'), true);
+    t.equal(await api.Scratch.canOpenWindow('index.html'), true);
+    t.equal(await api.Scratch.canOpenWindow(null), true);
 
     const calledWithURLs = [];
     vm.securityManager.canOpenWindow = async url => {
         calledWithURLs.push(url);
         return url === 'file:///etc/hosts';
     };
-    t.equal(await global.Scratch.canOpenWindow('data:text/html,test'), false);
-    t.equal(await global.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canOpenWindow('file:///etc/hosts'), true);
-    t.equal(await global.Scratch.canOpenWindow('https://example.com/'), false);
-    t.equal(await global.Scratch.canOpenWindow('index.html'), false);
-    t.equal(await global.Scratch.canOpenWindow(null), false);
+    t.equal(await api.Scratch.canOpenWindow('data:text/html,test'), false);
+    t.equal(await api.Scratch.canOpenWindow('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canOpenWindow('file:///etc/hosts'), true);
+    t.equal(await api.Scratch.canOpenWindow('https://example.com/'), false);
+    t.equal(await api.Scratch.canOpenWindow('index.html'), false);
+    t.equal(await api.Scratch.canOpenWindow(null), false);
     t.same(calledWithURLs, [
         'data:text/html,test',
         'blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd',
@@ -181,50 +181,50 @@ test('canOpenWindow', async t => {
 
 test('canRedirect', async t => {
     const vm = new VirtualMachine();
-    setupUnsandboxedExtensionAPI(vm);
+    const api = createAPI(vm);
     global.location = {
         href: 'https://example.com/'
     };
 
     // javascript: should never be allowed, shouldn't call security manager
     vm.securityManager.canRedirect = () => t.fail('should not call security manager for javascript:');
-    t.equal(await global.Scratch.canRedirect('javascript:alert(1)'), false);
+    t.equal(await api.Scratch.canRedirect('javascript:alert(1)'), false);
 
     vm.securityManager.canRedirect = () => false;
-    t.equal(await global.Scratch.canRedirect('data:text/html,test'), false);
-    t.equal(await global.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canRedirect('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canRedirect('https://example.com/'), false);
-    t.equal(await global.Scratch.canRedirect('index.html'), false);
-    t.equal(await global.Scratch.canRedirect(null), false);
+    t.equal(await api.Scratch.canRedirect('data:text/html,test'), false);
+    t.equal(await api.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canRedirect('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canRedirect('https://example.com/'), false);
+    t.equal(await api.Scratch.canRedirect('index.html'), false);
+    t.equal(await api.Scratch.canRedirect(null), false);
 
     vm.securityManager.canRedirect = () => Promise.resolve(false);
-    t.equal(await global.Scratch.canRedirect('data:text/html,test'), false);
-    t.equal(await global.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canRedirect('file:///etc/hosts'), false);
-    t.equal(await global.Scratch.canRedirect('https://example.com/'), false);
-    t.equal(await global.Scratch.canRedirect('index.html'), false);
-    t.equal(await global.Scratch.canRedirect(null), false);
+    t.equal(await api.Scratch.canRedirect('data:text/html,test'), false);
+    t.equal(await api.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canRedirect('file:///etc/hosts'), false);
+    t.equal(await api.Scratch.canRedirect('https://example.com/'), false);
+    t.equal(await api.Scratch.canRedirect('index.html'), false);
+    t.equal(await api.Scratch.canRedirect(null), false);
 
     vm.securityManager.canRedirect = () => true;
-    t.equal(await global.Scratch.canRedirect('data:text/html,test'), true);
-    t.equal(await global.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
-    t.equal(await global.Scratch.canRedirect('file:///etc/hosts'), true);
-    t.equal(await global.Scratch.canRedirect('https://example.com/'), true);
-    t.equal(await global.Scratch.canRedirect('index.html'), true);
-    t.equal(await global.Scratch.canRedirect(null), true);
+    t.equal(await api.Scratch.canRedirect('data:text/html,test'), true);
+    t.equal(await api.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), true);
+    t.equal(await api.Scratch.canRedirect('file:///etc/hosts'), true);
+    t.equal(await api.Scratch.canRedirect('https://example.com/'), true);
+    t.equal(await api.Scratch.canRedirect('index.html'), true);
+    t.equal(await api.Scratch.canRedirect(null), true);
 
     const calledWithURLs = [];
     vm.securityManager.canRedirect = async url => {
         calledWithURLs.push(url);
         return url === 'file:///etc/hosts';
     };
-    t.equal(await global.Scratch.canRedirect('data:text/html,test'), false);
-    t.equal(await global.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
-    t.equal(await global.Scratch.canRedirect('file:///etc/hosts'), true);
-    t.equal(await global.Scratch.canRedirect('https://example.com/'), false);
-    t.equal(await global.Scratch.canRedirect('index.html'), false);
-    t.equal(await global.Scratch.canRedirect(null), false);
+    t.equal(await api.Scratch.canRedirect('data:text/html,test'), false);
+    t.equal(await api.Scratch.canRedirect('blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd'), false);
+    t.equal(await api.Scratch.canRedirect('file:///etc/hosts'), true);
+    t.equal(await api.Scratch.canRedirect('https://example.com/'), false);
+    t.equal(await api.Scratch.canRedirect('index.html'), false);
+    t.equal(await api.Scratch.canRedirect(null), false);
     t.same(calledWithURLs, [
         'data:text/html,test',
         'blob:https://example.com/8c071bf8-c0b6-4a48-81d7-6413c2adf3dd',
diff --git a/test/integration/tw_unsandboxed_extensions.js b/test/integration/tw_unsandboxed_extensions.js
new file mode 100644
index 0000000000..079ba4b2cc
--- /dev/null
+++ b/test/integration/tw_unsandboxed_extensions.js
@@ -0,0 +1,265 @@
+const tap = require('tap');
+const {test} = tap;
+const VirtualMachine = require('../../src/virtual-machine');
+const {createAPI} = require('../../src/extension-support/tw-unsandboxed-extension-runner');
+
+/* globals Request */
+// Mock several browser APIs that unsandboxed extensions use.
+global.location = {
+    href: 'https://turbowarp.org/editor'
+};
+global.Request = class {
+    constructor (url) {
+        this.url = url;
+    }
+};
+global.fetch = (url, options = {}) => (
+    Promise.resolve(`[Response ${url instanceof Request ? url.url : url} options=${JSON.stringify(options)}]`)
+);
+global.window = {
+    open: (url, target, features) => `[Window ${url} target=${target || ''} features=${features || ''}]`
+};
+
+test('basic register', t => {
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    class MyExtension {}
+    api.Scratch.extensions.register(new MyExtension());
+
+    t.equal(api.extensions.length, 1);
+    t.ok(api.extensions[0] instanceof MyExtension);
+
+    api.Scratch.extensions.register(new MyExtension());
+    t.equal(api.extensions.length, 2);
+    t.ok(api.extensions[0] instanceof MyExtension);
+    t.ok(api.extensions[1] instanceof MyExtension);
+
+    t.end();
+});
+
+test('basic APIs', t => {
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    t.equal(api.Scratch.ArgumentType.NUMBER, 'number');
+    t.equal(api.Scratch.BlockType.REPORTER, 'reporter');
+    t.equal(api.Scratch.TargetType.SPRITE, 'sprite');
+    t.equal(api.Scratch.Cast.toNumber('3.14'), 3.14);
+
+    t.equal(api.Scratch.vm, vm);
+    t.equal(api.Scratch.renderer, vm.runtime.renderer);
+    t.equal(api.Scratch.extensions.unsandboxed, true);
+
+    t.end();
+});
+
+test('ScratchX', t => {
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    const ext = {
+        test: () => 2
+    };
+    const descriptor = {
+        blocks: [
+            ['r', 'test', 'test']
+        ]
+    };
+    api.ScratchExtensions.register('Test', descriptor, ext);
+
+    t.equal(api.extensions.length, 1);
+    t.end();
+});
+
+test('canFetch', t => {
+    // see tw_security_manager.js
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    api.Scratch.canFetch('https://example.com/').then(allowed => {
+        t.ok(allowed);
+        t.end();
+    });
+});
+
+test('fetch', async t => {
+    t.plan(5);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    api.Scratch.canFetch = url => url === 'https://example.com/2';
+    await t.rejects(api.Scratch.fetch('https://example.com/1'), /Permission to fetch https:\/\/example.com\/1 rejected/);
+    await t.rejects(api.Scratch.fetch(new Request('https://example.com/1')), /Permission to fetch https:\/\/example.com\/1 rejected/);
+    t.equal(await api.Scratch.fetch('https://example.com/2'), '[Response https://example.com/2 options={"redirect":"error"}]');
+    t.equal(await api.Scratch.fetch(new Request('https://example.com/2')), '[Response https://example.com/2 options={"redirect":"error"}]');
+    t.equal(await api.Scratch.fetch('https://example.com/2', {
+        // redirect should be ignored and always set to error
+        redirect: 'follow',
+        method: 'POST',
+        body: 'abc'
+    }), '[Response https://example.com/2 options={"redirect":"error","method":"POST","body":"abc"}]');
+    t.end();
+});
+
+test('canOpenWindow', async t => {
+    // see tw_security_manager.js
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    const result = api.Scratch.canOpenWindow('https://example.com/');
+    t.type(result, Promise);
+    t.equal(await result, true);
+    t.end();
+});
+
+test('openWindow', async t => {
+    t.plan(3);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    api.Scratch.canOpenWindow = url => url === 'https://example.com/2';
+    await t.rejects(api.Scratch.openWindow('https://example.com/1'), /Permission to open tab https:\/\/example.com\/1 rejected/);
+    t.equal(await api.Scratch.openWindow('https://example.com/2'), '[Window https://example.com/2 target=_blank features=noreferrer]');
+    t.equal(await api.Scratch.openWindow('https://example.com/2', 'popup=1'), '[Window https://example.com/2 target=_blank features=noreferrer,popup=1]');
+    t.end();
+});
+
+test('canRedirect', async t => {
+    // see tw_security_manager.js
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    const result = api.Scratch.canRedirect('https://example.com/');
+    t.type(result, Promise);
+    t.equal(await result, true);
+    t.end();
+});
+
+test('redirect', async t => {
+    t.plan(3);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+    api.Scratch.canRedirect = url => url === 'https://example.com/safe-redirect-place';
+    await t.rejects(api.Scratch.redirect('https://example.com/not-safe'), /Permission to redirect to https:\/\/example.com\/not-safe rejected/);
+    t.equal(global.location.href, 'https://turbowarp.org/editor');
+    await api.Scratch.redirect('https://example.com/safe-redirect-place');
+    t.equal(global.location.href, 'https://example.com/safe-redirect-place');
+    t.end();
+});
+
+test('translate', async t => {
+    t.plan(5);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    t.equal(api.Scratch.translate({
+        id: 'test1',
+        default: 'Message 1: {var}',
+        description: 'Description'
+    }, {
+        var: 'test'
+    }), 'Message 1: test');
+    t.equal(api.Scratch.translate('test1 {var}', {
+        var: 'ok'
+    }), 'test1 ok');
+
+    api.Scratch.translate.setup({
+        en: {
+            test1: 'EN Message 1: {var}'
+        },
+        es: {
+            test1: 'ES Message 1: {var}'
+        }
+    });
+    t.equal(api.Scratch.translate({
+        id: 'test1',
+        default: 'Message 1: {var}',
+        description: 'Description'
+    }, {
+        var: 'test'
+    }), 'EN Message 1: test');
+    t.equal(api.Scratch.translate('test1 {var}', {
+        var: 'ok'
+    }), 'test1 ok');
+
+    await vm.setLocale('es');
+    // do not call setup() again; real extensions will not do that.
+    // need to make sure that the translatiosn are saved after calling setLocale.
+    t.equal(api.Scratch.translate({
+        id: 'test1',
+        default: 'Message 1: {var}',
+        description: 'Description'
+    }, {
+        var: 'test'
+    }), 'ES Message 1: test');
+
+    t.end();
+});
+
+test('canRecordAudio', async t => {
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    vm.securityManager.canRecordAudio = () => false;
+    t.equal(await api.Scratch.canRecordAudio(), false);
+
+    vm.securityManager.canRecordAudio = () => true;
+    t.equal(await api.Scratch.canRecordAudio(), true);
+    
+    t.end();
+});
+
+test('canRecordVideo', async t => {
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    vm.securityManager.canRecordVideo = () => false;
+    t.equal(await api.Scratch.canRecordVideo(), false);
+
+    vm.securityManager.canRecordVideo = () => true;
+    t.equal(await api.Scratch.canRecordVideo(), true);
+    
+    t.end();
+});
+
+test('canReadClipboard', async t => {
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    vm.securityManager.canReadClipboard = () => false;
+    t.equal(await api.Scratch.canReadClipboard(), false);
+
+    vm.securityManager.canReadClipboard = () => true;
+    t.equal(await api.Scratch.canReadClipboard(), true);
+    
+    t.end();
+});
+
+test('canNotify', async t => {
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    vm.securityManager.canNotify = () => false;
+    t.equal(await api.Scratch.canNotify(), false);
+
+    vm.securityManager.canNotify = () => true;
+    t.equal(await api.Scratch.canNotify(), true);
+    
+    t.end();
+});
+
+test('canGeolocate', async t => {
+    t.plan(2);
+    const vm = new VirtualMachine();
+    const api = createAPI(vm);
+
+    vm.securityManager.canGeolocate = () => false;
+    t.equal(await api.Scratch.canGeolocate(), false);
+
+    vm.securityManager.canGeolocate = () => true;
+    t.equal(await api.Scratch.canGeolocate(), true);
+    
+    t.end();
+});
diff --git a/test/unit/tw_extension_manager.js b/test/unit/tw_extension_manager.js
index c7b18defb6..24e74d2fa8 100644
--- a/test/unit/tw_extension_manager.js
+++ b/test/unit/tw_extension_manager.js
@@ -27,42 +27,38 @@ test('_isValidExtensionURL', t => {
 test('loadExtensionURL, getExtensionURLs, deduplication', async t => {
     const vm = new VM();
 
-    let loadedExtensions = 0;
     vm.extensionManager.securityManager.getSandboxMode = () => 'unsandboxed';
-    global.document = {
-        createElement: () => {
-            loadedExtensions++;
-            const element = {};
-            setTimeout(() => {
-                global.Scratch.extensions.register({
-                    getInfo: () => ({
-                        id: `extension${loadedExtensions}`
-                    })
-                });
+
+    global.loadedExtensionCount = 0;
+    global.fetch = () => Promise.resolve({
+        ok: true,
+        text: () => Promise.resolve(`
+            const id = ++global.loadedExtensionCount;
+            Scratch.extensions.register({
+                getInfo: () => ({
+                    id: "testextension" + id
+                }),
+                blocks: []
             });
-            return element;
-        },
-        body: {
-            appendChild: () => {}
-        }
-    };
+        `)
+    });
 
     const url1 = 'https://turbowarp.org/1.js';
     t.equal(vm.extensionManager.isExtensionURLLoaded(url1), false);
     t.same(vm.extensionManager.getExtensionURLs(), {});
     await vm.extensionManager.loadExtensionURL(url1);
     t.equal(vm.extensionManager.isExtensionURLLoaded(url1), true);
-    t.equal(loadedExtensions, 1);
+    t.equal(global.loadedExtensionCount, 1);
     t.same(vm.extensionManager.getExtensionURLs(), {
-        extension1: url1
+        testextension1: url1
     });
 
     // Loading the extension again should do nothing.
     await vm.extensionManager.loadExtensionURL(url1);
     t.equal(vm.extensionManager.isExtensionURLLoaded(url1), true);
-    t.equal(loadedExtensions, 1);
+    t.equal(global.loadedExtensionCount, 1);
     t.same(vm.extensionManager.getExtensionURLs(), {
-        extension1: url1
+        testextension1: url1
     });
 
     // Loading another extension should work
@@ -70,10 +66,10 @@ test('loadExtensionURL, getExtensionURLs, deduplication', async t => {
     t.equal(vm.extensionManager.isExtensionURLLoaded(url2), false);
     await vm.extensionManager.loadExtensionURL(url2);
     t.equal(vm.extensionManager.isExtensionURLLoaded(url2), true);
-    t.equal(loadedExtensions, 2);
+    t.equal(global.loadedExtensionCount, 2);
     t.same(vm.extensionManager.getExtensionURLs(), {
-        extension1: url1,
-        extension2: url2
+        testextension1: url1,
+        testextension2: url2
     });
 
     t.end();
diff --git a/test/unit/tw_scratchx.js b/test/unit/tw_scratchx.js
index 90ecb1c307..bf2d8d9562 100644
--- a/test/unit/tw_scratchx.js
+++ b/test/unit/tw_scratchx.js
@@ -1,5 +1,5 @@
 const ScratchXUtilities = require('../../src/extension-support/tw-scratchx-utilities');
-const ScratchExtensions = require('../../src/extension-support/tw-scratchx-compatibility-layer');
+const createScratchX = require('../../src/extension-support/tw-scratchx-compatibility-layer');
 const {test} = require('tap');
 
 test('argument index to id', t => {
@@ -19,7 +19,34 @@ test('generate extension id', t => {
     t.end();
 });
 
+const mockScratchExtensions = () => {
+    const mockScratch = {};
+    return createScratchX(mockScratch);
+};
+
+const convert = (...args) => {
+    let registered = null;
+    const mockScratch = {
+        extensions: {
+            register: extensionObject => {
+                if (registered) {
+                    // In tests we don't want this
+                    throw new Error('register() called twice');
+                }
+                registered = extensionObject;
+            }
+        }
+    };
+    const ScratchExtensions = createScratchX(mockScratch);
+    ScratchExtensions.register(...args);
+    if (!registered) {
+        throw new Error('Did not register()');
+    }
+    return registered;
+};
+
 test('register', t => {
+    const ScratchExtensions = mockScratchExtensions();
     t.type(ScratchExtensions.register, 'function');
     t.end();
 });
@@ -49,7 +76,7 @@ test('complex extension', async t => {
 
     const touching = sprite => sprite === 'Sprite9';
 
-    const converted = ScratchExtensions.convert(
+    const converted = convert(
         'My Extension',
         {
             blocks: [
@@ -215,7 +242,7 @@ test('complex extension', async t => {
 });
 
 test('display name', t => {
-    const converted = ScratchExtensions.convert(
+    const converted = convert(
         'Internal Name',
         {
             blocks: [],
@@ -234,7 +261,7 @@ test('_getStatus', t => {
         status: 2,
         msg: 'Ready'
     });
-    const converted = ScratchExtensions.convert(
+    const converted = convert(
         'Name',
         {
             blocks: []
diff --git a/test/unit/tw_unsandboxed_extensions.js b/test/unit/tw_unsandboxed_extensions.js
deleted file mode 100644
index 4052486678..0000000000
--- a/test/unit/tw_unsandboxed_extensions.js
+++ /dev/null
@@ -1,358 +0,0 @@
-const tap = require('tap');
-const UnsandboxedExtensionRunner = require('../../src/extension-support/tw-unsandboxed-extension-runner');
-const VirtualMachine = require('../../src/virtual-machine');
-
-// Mock enough of the document API for the extension runner to think it works.
-// To more accurately test this, we want to make sure that the URLs we pass in are just strings.
-// We use a bit of hacky state here to make our document mock know what function to run
-// when a script with a given URL "loads"
-const scriptCallbacks = new Map();
-const setScript = (src, callback) => {
-    scriptCallbacks.set(src, callback);
-};
-global.document = {
-    createElement: tagName => {
-        if (tagName.toLowerCase() !== 'script') {
-            throw new Error(`Unknown element: ${tagName}`);
-        }
-        return {
-            tagName: 'SCRIPT',
-            src: '',
-            onload: () => {},
-            onerror: () => {}
-        };
-    },
-    body: {
-        appendChild: element => {
-            if (element.tagName === 'SCRIPT') {
-                setTimeout(() => {
-                    const callback = scriptCallbacks.get(element.src);
-                    if (callback) {
-                        callback();
-                        element.onload();
-                    } else {
-                        element.onerror();
-                    }
-                }, 50);
-            }
-        }
-    }
-};
-
-// Mock various DOM APIs for fetching, window opening, redirecting, etc.
-/* globals Request */
-global.Request = class {
-    constructor (url) {
-        this.url = url;
-    }
-};
-global.fetch = (url, options = {}) => (
-    Promise.resolve(`[Response ${url instanceof Request ? url.url : url} options=${JSON.stringify(options)}]`)
-);
-global.window = {
-    open: (url, target, features) => `[Window ${url} target=${target || ''} features=${features || ''}]`
-};
-
-tap.beforeEach(async () => {
-    scriptCallbacks.clear();
-    global.location = {
-        href: 'https://example.com/'
-    };
-});
-
-const {test} = tap;
-
-test('basic API', async t => {
-    t.plan(9);
-    const vm = new VirtualMachine();
-    class MyExtension {}
-    setScript('https://turbowarp.org/1.js', () => {
-        t.equal(global.Scratch.vm, vm);
-        t.equal(global.Scratch.renderer, vm.runtime.renderer);
-        t.equal(global.Scratch.extensions.unsandboxed, true);
-
-        // These APIs are tested elsewhere, just make sure they're getting exported
-        t.equal(global.Scratch.ArgumentType.NUMBER, 'number');
-        t.equal(global.Scratch.BlockType.REPORTER, 'reporter');
-        t.equal(global.Scratch.TargetType.SPRITE, 'sprite');
-        t.equal(global.Scratch.Cast.toNumber('3.14'), 3.14);
-
-        global.Scratch.extensions.register(new MyExtension());
-    });
-    const extensions = await UnsandboxedExtensionRunner.load('https://turbowarp.org/1.js', vm);
-    t.equal(extensions.length, 1);
-    t.ok(extensions[0] instanceof MyExtension);
-    t.end();
-});
-
-test('multiple VMs loading extensions', async t => {
-    const vm1 = new VirtualMachine();
-    const vm2 = new VirtualMachine();
-
-    class Extension1 {}
-    class Extension2 {}
-
-    let api1 = null;
-    setScript('https://turbowarp.org/1.js', async () => {
-        // Even if this extension takes a while to register, we should still have our own
-        // global.Scratch.
-        await new Promise(resolve => setTimeout(resolve, 100));
-
-        if (api1) throw new Error('already ran 1');
-        api1 = global.Scratch;
-        global.Scratch.extensions.register(new Extension1());
-    });
-
-    let api2 = null;
-    setScript('https://turbowarp.org/2.js', () => {
-        if (api2) throw new Error('already ran 2');
-        api2 = global.Scratch;
-        global.Scratch.extensions.register(new Extension2());
-    });
-
-    const extensions = await Promise.all([
-        UnsandboxedExtensionRunner.load('https://turbowarp.org/1.js', vm1),
-        UnsandboxedExtensionRunner.load('https://turbowarp.org/2.js', vm2)
-    ]);
-
-    t.not(api1, api2);
-    t.type(api1.extensions.register, 'function');
-    t.type(api2.extensions.register, 'function');
-    t.equal(api1.vm, vm1);
-    t.equal(api2.vm, vm2);
-
-    t.equal(extensions.length, 2);
-    t.equal(extensions[0].length, 1);
-    t.equal(extensions[1].length, 1);
-    t.ok(extensions[0][0] instanceof Extension1);
-    t.ok(extensions[1][0] instanceof Extension2);
-
-    t.end();
-});
-
-test('register multiple extensions in one script', async t => {
-    const vm = new VirtualMachine();
-    class Extension1 {}
-    class Extension2 {}
-    setScript('https://turbowarp.org/multiple.js', () => {
-        global.Scratch.extensions.register(new Extension1());
-        global.Scratch.extensions.register(new Extension2());
-    });
-    const extensions = await UnsandboxedExtensionRunner.load('https://turbowarp.org/multiple.js', vm);
-    t.equal(extensions.length, 2);
-    t.ok(extensions[0] instanceof Extension1);
-    t.ok(extensions[1] instanceof Extension2);
-    t.end();
-});
-
-test('extension error results in rejection', async t => {
-    const vm = new VirtualMachine();
-    try {
-        await UnsandboxedExtensionRunner.load('https://turbowarp.org/404.js', vm);
-        // Above should throw an error as the script will not load successfully
-        t.fail();
-    } catch (e) {
-        t.pass();
-    }
-    t.end();
-});
-
-test('ScratchX', async t => {
-    const vm = new VirtualMachine();
-    setScript('https://turbowarp.org/scratchx.js', () => {
-        const ext = {
-            test: () => 2
-        };
-        const descriptor = {
-            blocks: [
-                ['r', 'test', 'test']
-            ]
-        };
-        global.ScratchExtensions.register('Test', descriptor, ext);
-    });
-    const extensions = await UnsandboxedExtensionRunner.load('https://turbowarp.org/scratchx.js', vm);
-    t.equal(extensions.length, 1);
-    t.equal(extensions[0].test(), 2);
-    t.end();
-});
-
-test('canFetch', async t => {
-    // see tw_security_manager.js
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    const result = global.Scratch.canFetch('https://example.com/');
-    t.type(result, Promise);
-    t.equal(await result, true);
-    t.end();
-});
-
-test('fetch', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    global.Scratch.canFetch = url => url === 'https://example.com/2';
-    await t.rejects(global.Scratch.fetch('https://example.com/1'), /Permission to fetch https:\/\/example.com\/1 rejected/);
-    await t.rejects(global.Scratch.fetch(new Request('https://example.com/1')), /Permission to fetch https:\/\/example.com\/1 rejected/);
-    t.equal(await global.Scratch.fetch('https://example.com/2'), '[Response https://example.com/2 options={"redirect":"error"}]');
-    t.equal(await global.Scratch.fetch(new Request('https://example.com/2')), '[Response https://example.com/2 options={"redirect":"error"}]');
-    t.equal(await global.Scratch.fetch('https://example.com/2', {
-        // redirect should be ignored and always set to error
-        redirect: 'follow',
-        method: 'POST',
-        body: 'abc'
-    }), '[Response https://example.com/2 options={"redirect":"error","method":"POST","body":"abc"}]');
-    t.end();
-});
-
-test('canOpenWindow', async t => {
-    // see tw_security_manager.js
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    const result = global.Scratch.canOpenWindow('https://example.com/');
-    t.type(result, Promise);
-    t.equal(await result, true);
-    t.end();
-});
-
-test('openWindow', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    global.Scratch.canOpenWindow = url => url === 'https://example.com/2';
-    await t.rejects(global.Scratch.openWindow('https://example.com/1'), /Permission to open tab https:\/\/example.com\/1 rejected/);
-    t.equal(await global.Scratch.openWindow('https://example.com/2'), '[Window https://example.com/2 target=_blank features=noreferrer]');
-    t.equal(await global.Scratch.openWindow('https://example.com/2', 'popup=1'), '[Window https://example.com/2 target=_blank features=noreferrer,popup=1]');
-    t.end();
-});
-
-test('canRedirect', async t => {
-    // see tw_security_manager.js
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    const result = global.Scratch.canRedirect('https://example.com/');
-    t.type(result, Promise);
-    t.equal(await result, true);
-    t.end();
-});
-
-test('redirect', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-    global.Scratch.canRedirect = url => url === 'https://example.com/2';
-    await t.rejects(global.Scratch.redirect('https://example.com/1'), /Permission to redirect to https:\/\/example.com\/1 rejected/);
-    t.equal(global.location.href, 'https://example.com/');
-    await global.Scratch.redirect('https://example.com/2');
-    t.equal(global.location.href, 'https://example.com/2');
-    t.end();
-});
-
-test('translate', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    t.equal(global.Scratch.translate({
-        id: 'test1',
-        default: 'Message 1: {var}',
-        description: 'Description'
-    }, {
-        var: 'test'
-    }), 'Message 1: test');
-    t.equal(global.Scratch.translate('test1 {var}', {
-        var: 'ok'
-    }), 'test1 ok');
-
-    global.Scratch.translate.setup({
-        en: {
-            test1: 'EN Message 1: {var}'
-        },
-        es: {
-            test1: 'ES Message 1: {var}'
-        }
-    });
-    t.equal(global.Scratch.translate({
-        id: 'test1',
-        default: 'Message 1: {var}',
-        description: 'Description'
-    }, {
-        var: 'test'
-    }), 'EN Message 1: test');
-    t.equal(global.Scratch.translate('test1 {var}', {
-        var: 'ok'
-    }), 'test1 ok');
-
-    await vm.setLocale('es');
-    // do not call setup() again; real extensions will not do that.
-    // need to make sure that the translatiosn are saved after calling setLocale.
-    t.equal(global.Scratch.translate({
-        id: 'test1',
-        default: 'Message 1: {var}',
-        description: 'Description'
-    }, {
-        var: 'test'
-    }), 'ES Message 1: test');
-
-    t.end();
-});
-
-test('canRecordAudio', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    vm.securityManager.canRecordAudio = () => false;
-    t.equal(await global.Scratch.canRecordAudio(), false);
-
-    vm.securityManager.canRecordAudio = () => true;
-    t.equal(await global.Scratch.canRecordAudio(), true);
-    
-    t.end();
-});
-
-test('canRecordVideo', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    vm.securityManager.canRecordVideo = () => false;
-    t.equal(await global.Scratch.canRecordVideo(), false);
-
-    vm.securityManager.canRecordVideo = () => true;
-    t.equal(await global.Scratch.canRecordVideo(), true);
-    
-    t.end();
-});
-
-test('canReadClipboard', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    vm.securityManager.canReadClipboard = () => false;
-    t.equal(await global.Scratch.canReadClipboard(), false);
-
-    vm.securityManager.canReadClipboard = () => true;
-    t.equal(await global.Scratch.canReadClipboard(), true);
-    
-    t.end();
-});
-
-test('canNotify', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    vm.securityManager.canNotify = () => false;
-    t.equal(await global.Scratch.canNotify(), false);
-
-    vm.securityManager.canNotify = () => true;
-    t.equal(await global.Scratch.canNotify(), true);
-    
-    t.end();
-});
-
-test('canGeolocate', async t => {
-    const vm = new VirtualMachine();
-    UnsandboxedExtensionRunner.setupUnsandboxedExtensionAPI(vm);
-
-    vm.securityManager.canGeolocate = () => false;
-    t.equal(await global.Scratch.canGeolocate(), false);
-
-    vm.securityManager.canGeolocate = () => true;
-    t.equal(await global.Scratch.canGeolocate(), true);
-    
-    t.end();
-});