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diff --git a/dom/webidl/WindowOrWorkerGlobalScope.webidl b/dom/webidl/WindowOrWorkerGlobalScope.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:
+ * https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+ * https://fetch.spec.whatwg.org/#fetch-method
+ * https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+ * https://w3c.github.io/ServiceWorker/#self-caches
+ */
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface WindowOrWorkerGlobalScope {
+  // XXXbz We don't implement 'origin' yet on either window or worker globals.
+  // See bug 1306170.
+  // [Replaceable] readonly attribute USVString origin;
+
+  // base64 utility methods
+  [Throws]
+  DOMString btoa(DOMString btoa);
+  [Throws]
+  DOMString atob(DOMString atob);
+
+  // timers
+  // NOTE: We're using overloads where the spec uses a union.  Should
+  // be black-box the same.
+  [Throws]
+  long setTimeout(Function handler, optional long timeout = 0, any... arguments);
+  [Throws]
+  long setTimeout(DOMString handler, optional long timeout = 0, any... unused);
+  void clearTimeout(optional long handle = 0);
+  [Throws]
+  long setInterval(Function handler, optional long timeout, any... arguments);
+  [Throws]
+  long setInterval(DOMString handler, optional long timeout, any... unused);
+  void clearInterval(optional long handle = 0);
+
+  // ImageBitmap
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage);
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage, long aSx, long aSy, long aSw, long aSh);
+};
+
+// https://fetch.spec.whatwg.org/#fetch-method
+partial interface WindowOrWorkerGlobalScope {
+  [NewObject] Promise<Response> fetch(RequestInfo input, optional RequestInit init);
+};
+
+// https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+partial interface WindowOrWorkerGlobalScope {
+  readonly attribute boolean isSecureContext;
+};
+
+// http://w3c.github.io/IndexedDB/#factory-interface
+partial interface WindowOrWorkerGlobalScope {
+   // readonly attribute IDBFactory indexedDB;
+   [Throws]
+   readonly attribute IDBFactory? indexedDB;
+};
+
+// https://w3c.github.io/ServiceWorker/#self-caches
+partial interface WindowOrWorkerGlobalScope {
+  [Throws, Func="mozilla::dom::cache::CacheStorage::PrefEnabled", SameObject]
+  readonly attribute CacheStorage caches;
+};
+
+// Mozilla extensions
+partial interface WindowOrWorkerGlobalScope {
+  // Extensions to ImageBitmap bits.
+  // Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+  // underlying image data
+  //
+  // Note:
+  // Overloaded functions cannot have different "extended attributes",
+  // so I cannot add preference on the extended version of createImageBitmap().
+  // To work around, I will then check the preference at run time and throw if
+  // the preference is set to be false.
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage, long aOffset, long aLength, ImageBitmapFormat aFormat, ImagePixelLayout aLayout);
+};