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diff --git a/dom/webidl/InstallTrigger.webidl b/dom/webidl/InstallTrigger.webidl
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+++ b/dom/webidl/InstallTrigger.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/.
+ */
+
+
+/**
+ * A callback function that webpages can implement to be notified when triggered
+ * installs complete.
+ */
+callback InstallTriggerCallback = undefined(DOMString url, short status);
+
+dictionary InstallTriggerData {
+  DOMString URL;
+  DOMString? IconURL;
+  DOMString? Hash;
+};
+
+/**
+ * The interface for the InstallTrigger object available to all websites.
+ */
+[ChromeOnly,
+ JSImplementation="@mozilla.org/addons/installtrigger;1",
+ Exposed=Window]
+interface InstallTriggerImpl {
+  /**
+   * Retained for backwards compatibility.
+   */
+  const unsigned short SKIN = 1;
+  const unsigned short LOCALE = 2;
+  const unsigned short CONTENT = 4;
+  const unsigned short PACKAGE = 7;
+
+  /**
+   * Tests if installation is enabled.
+   */
+  boolean enabled();
+
+  /**
+   * Tests if installation is enabled.
+   *
+   * @deprecated Use "enabled" in the future.
+   */
+  boolean updateEnabled();
+
+  /**
+   * Starts a new installation of a set of add-ons.
+   *
+   * @param  aArgs
+   *         The add-ons to install. This should be a JS object, each property
+   *         is the name of an add-on to be installed. The value of the
+   *         property should either be a string URL, or an object with the
+   *         following properties:
+   *          * URL for the add-on's URL
+   *          * IconURL for an icon for the add-on
+   *          * Hash for a hash of the add-on
+   * @param  aCallback
+   *         A callback to call as each installation succeeds or fails
+   * @return true if the installations were successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean install(record<DOMString, (DOMString or InstallTriggerData)> installs,
+                  optional InstallTriggerCallback callback);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aType
+   *         Unused, retained for backwards compatibility
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aSkin
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean installChrome(unsigned short type, DOMString url, DOMString skin);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aFlags
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean startSoftwareUpdate(DOMString url, optional unsigned short flags);
+};