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diff --git a/dom/webidl/AddonManager.webidl b/dom/webidl/AddonManager.webidl
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+/* 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/.
+ */
+
+/* We need a JSImplementation but cannot get one without a contract ID.
+   Since Addon and AddonInstall are only ever created from JS they don't need
+   real contract IDs. */
+[ChromeOnly, JSImplementation="dummy"]
+interface Addon {
+  // The add-on's ID.
+  readonly attribute DOMString id;
+  // The add-on's version.
+  readonly attribute DOMString version;
+  // The add-on's type (extension, theme, etc.).
+  readonly attribute DOMString type;
+  // The add-on's name in the current locale.
+  readonly attribute DOMString name;
+  // The add-on's description in the current locale.
+  readonly attribute DOMString description;
+  // If the user has enabled this add-on, note that it still may not be running
+  // depending on whether enabling requires a restart or if the add-on is
+  // incompatible in some way.
+  readonly attribute boolean isEnabled;
+  // If the add-on is currently active in the browser.
+  readonly attribute boolean isActive;
+  // If the add-on may be uninstalled
+  readonly attribute boolean canUninstall;
+
+  Promise<boolean> uninstall();
+  Promise<void> setEnabled(boolean value);
+};
+
+[ChromeOnly, JSImplementation="dummy"]
+interface AddonInstall : EventTarget {
+  // One of the STATE_* symbols from AddonManager.jsm
+  readonly attribute DOMString state;
+  // One of the ERROR_* symbols from AddonManager.jsm, or null
+  readonly attribute DOMString? error;
+  // How many bytes have been downloaded
+  readonly attribute long long progress;
+  // How many total bytes will need to be downloaded or -1 if unknown
+  readonly attribute long long maxProgress;
+
+  Promise<void> install();
+  Promise<void> cancel();
+};
+
+dictionary addonInstallOptions {
+  required DOMString url;
+  // If a non-empty string is passed for "hash", it is used to verify the
+  // checksum of the downloaded XPI before installing.  If is omitted or if
+  // it is null or empty string, no checksum verification is performed.
+  DOMString? hash = null;
+};
+
+[HeaderFile="mozilla/AddonManagerWebAPI.h",
+ Func="mozilla::AddonManagerWebAPI::IsAPIEnabled",
+ NavigatorProperty="mozAddonManager",
+ JSImplementation="@mozilla.org/addon-web-api/manager;1"]
+interface AddonManager : EventTarget {
+  /**
+   * Gets information about an add-on
+   *
+   * @param  id
+   *         The ID of the add-on to test for.
+   * @return A promise. It will resolve to an Addon if the add-on is installed.
+   */
+  Promise<Addon> getAddonByID(DOMString id);
+
+  /**
+   * Creates an AddonInstall object for a given URL.
+   *
+   * @param options
+   *        Only one supported option: 'url', the URL of the addon to install.
+   * @return A promise that resolves to an instance of AddonInstall.
+   */
+  Promise<AddonInstall> createInstall(optional addonInstallOptions options);
+
+  /* Hooks for managing event listeners */
+  [ChromeOnly]
+  void eventListenerWasAdded(DOMString type);
+  [ChromeOnly]
+  void eventListenerWasRemoved(DOMString type);
+};
+
+[ChromeOnly,Exposed=System,HeaderFile="mozilla/AddonManagerWebAPI.h"]
+interface AddonManagerPermissions {
+  static boolean isHostPermitted(DOMString host);
+};
+