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diff --git a/dom/webidl/WorkerGlobalScope.webidl b/dom/webidl/WorkerGlobalScope.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/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=(Worker)]
+interface WorkerGlobalScope : EventTarget {
+  [Constant, Cached]
+  readonly attribute WorkerGlobalScope self;
+  readonly attribute WorkerLocation location;
+  readonly attribute WorkerNavigator navigator;
+
+  [Throws]
+  undefined importScripts(DOMString... urls);
+
+  attribute OnErrorEventHandler onerror;
+
+  attribute EventHandler onlanguagechange;
+  attribute EventHandler onoffline;
+  attribute EventHandler ononline;
+  attribute EventHandler onrejectionhandled;
+  attribute EventHandler onunhandledrejection;
+  // also has additional members in a partial interface
+};
+
+WorkerGlobalScope includes GlobalCrypto;
+WorkerGlobalScope includes FontFaceSource;
+WorkerGlobalScope includes WindowOrWorkerGlobalScope;
+
+// Mozilla extensions
+partial interface WorkerGlobalScope {
+
+  undefined dump(optional DOMString str);
+
+  // https://w3c.github.io/hr-time/#the-performance-attribute
+  [Constant, Cached, Replaceable, BinaryName="getPerformance"]
+  readonly attribute Performance performance;
+
+  [Func="WorkerGlobalScope::IsInAutomation", Throws]
+  object getJSTestingFunctions();
+};