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diff --git a/dom/webidl/ExtensionBrowser.webidl b/dom/webidl/ExtensionBrowser.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to interface mixin for the additional globals that should be
+ * available in windows and service workers allowed to access the WebExtensions API and
+ * the WebExtensions browser API namespace.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+// WebExtensions API interface mixin (used to include ExtensionBrowser interface
+// in the ServiceWorkerGlobalScope and Window).
+[Exposed=(ServiceWorker)]
+interface mixin ExtensionGlobalsMixin {
+  [Replaceable, SameObject, BinaryName="AcquireExtensionBrowser",
+   BindingAlias="chrome", Func="extensions::ExtensionAPIAllowed"]
+  readonly attribute ExtensionBrowser browser;
+};
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionBrowser {
+  // A mock API only exposed in tests to unit test the internals
+  // meant to be reused by the real WebExtensions API bindings
+  // in xpcshell tests.
+  [Replaceable, SameObject, BinaryName="GetExtensionMockAPI",
+   Func="mozilla::extensions::ExtensionMockAPI::IsAllowed",
+   Pref="extensions.webidl-api.expose_mock_interface"]
+  readonly attribute ExtensionMockAPI mockExtensionAPI;
+
+  // `browser.alarms` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionAlarms",
+   Func="mozilla::extensions::ExtensionAlarms::IsAllowed"]
+  readonly attribute ExtensionAlarms alarms;
+
+  // `browser.browserSettings` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionBrowserSettings",
+   Func="mozilla::extensions::ExtensionBrowserSettings::IsAllowed"]
+  readonly attribute ExtensionBrowserSettings browserSettings;
+
+  // `browser.dns` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionDns",
+   Func="mozilla::extensions::ExtensionDns::IsAllowed"]
+  readonly attribute ExtensionDns dns;
+
+  // `browser.proxy` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionProxy",
+   Func="mozilla::extensions::ExtensionProxy::IsAllowed"]
+  readonly attribute ExtensionProxy proxy;
+
+  // `browser.runtime` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionRuntime",
+   Func="mozilla::extensions::ExtensionRuntime::IsAllowed"]
+  readonly attribute ExtensionRuntime runtime;
+
+  // `browser.scripting` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionScripting",
+    Func="mozilla::extensions::ExtensionScripting::IsAllowed"]
+  readonly attribute ExtensionScripting scripting;
+
+  // `browser.test` API namespace, available in tests.
+  [Replaceable, SameObject, BinaryName="GetExtensionTest",
+   Func="mozilla::extensions::ExtensionTest::IsAllowed"]
+  readonly attribute ExtensionTest test;
+};