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diff --git a/widget/nsILegacyJumpListBuilder.idl b/widget/nsILegacyJumpListBuilder.idl
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+++ b/widget/nsILegacyJumpListBuilder.idl
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+/* -*- Mode: C++; 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/. */
+
+#include "nsISupports.idl"
+
+interface nsIArray;
+
+[scriptable, function, uuid(5131a62a-e99f-4631-9138-751f8aad1ae4)]
+interface nsILegacyJumpListCommittedCallback : nsISupports
+{
+  void done(in boolean result);
+};
+
+[scriptable, uuid(1FE6A9CD-2B18-4dd5-A176-C2B32FA4F683)]
+interface nsILegacyJumpListBuilder : nsISupports
+{
+  /**
+   * JumpLists
+   *
+   * Jump lists are built and then applied. Modifying an applied jump list is not
+   * permitted. Callers should begin the creation of a new jump list using
+   * initListBuild, add sub lists using addListToBuild, then commit the jump list
+   * using commitListBuild. Lists are built in real-time during the sequence of
+   * build calls, make sure to check for errors on each individual step.
+   *
+   * The default number of allowed items in a jump list is ten. Users can change
+   * the number through system preferences. User may also pin items to jump lists,
+   * which take up additional slots. Applications do not have control over the
+   * number of items allowed in jump lists; excess items added are dropped by the
+   * system. Item insertion priority is defined as first to last added.
+   *
+   * Users may remove items from jump lists after they are commited. The system
+   * tracks removed items between commits. A list of these items is returned by
+   * a call to initListBuild. nsILegacyJumpListBuilder does not filter entries added that
+   * have been removed since the last commit. To prevent repeatedly adding entries
+   * users have removed, applications are encoraged to track removed items
+   * internally.
+   *
+   * Each list is made up of an array of nsILegacyJumpListItem representing items
+   * such as shortcuts, links, and separators. See nsILegacyJumpListItem for information
+   * on adding additional jump list types.
+   */
+
+  /**
+   * List Types
+   */
+
+  /**
+   * Task List
+   *
+   * Tasks are common actions performed by users within the application. A task
+   * can be represented by an application shortcut and associated command line
+   * parameters or a URI. Task lists should generally be static lists that do not
+   * change often, if at all - similar to an application menu.
+   *
+   * Tasks are given the highest priority of all lists when space is limited.
+   */
+  const short JUMPLIST_CATEGORY_TASKS = 0;
+
+  /**
+   * Recent or Frequent list
+   *
+   * Recent and frequent lists are based on Window's recent document lists. The
+   * lists are generated automatically by Windows. Applications that use recent
+   * or frequent lists should keep document use tracking up to date by calling
+   * the SHAddToRecentDocs shell api.
+   */
+  const short JUMPLIST_CATEGORY_RECENT       = 1;
+  const short JUMPLIST_CATEGORY_FREQUENT     = 2;
+
+  /**
+   * Custom Lists
+   *
+   * Custom lists can be made up of tasks, links, and separators. The title of
+   * of the list is passed through the optional string parameter of addBuildList.
+   */
+  const short JUMPLIST_CATEGORY_CUSTOMLIST   = 3;
+
+  /**
+   * Indicates whether jump list taskbar features are supported by the current
+   * host.
+   */
+  readonly attribute short available;
+
+  /**
+   * JumpList management
+   *
+   * @throw NS_ERROR_NOT_AVAILABLE on all calls if taskbar functionality
+   * is not supported by the operating system.
+   */
+
+  /**
+   * Indicates if a commit has already occurred in this session.
+   */
+  readonly attribute boolean isListCommitted;
+
+  /**
+   * The maximum number of jump list items the current desktop can support.
+   */
+  readonly attribute short maxListItems;
+
+  /**
+   * Initializes a jump list build and returns a promise with the list of
+   * items the user removed since the last time a jump list was committed.
+   * Removed items can become state after initListBuild is called, lists
+   * should be built in single-shot fasion.
+   *
+   * @returns a promise with the list of items that were removed by the user
+   * since the last commit.
+   */
+  [implicit_jscontext]
+  Promise initListBuild();
+
+  /**
+   * Adds a list and if required, a set of items for the list.
+   *
+   * @param aCatType
+   *        The type of list to add.
+   * @param items
+   *        An array of nsILegacyJumpListItem items to add to the list.
+   * @param catName
+   *        For custom lists, the title of the list.
+   *
+   * @returns true if the operation completed successfully.
+   *
+   * @throw NS_ERROR_INVALID_ARG if incorrect parameters are passed for
+   * a particular category or item type.
+   * @throw NS_ERROR_ILLEGAL_VALUE if an item is added that was removed
+   * since the last commit.
+   * @throw NS_ERROR_UNEXPECTED on internal errors.
+   */
+  boolean addListToBuild(in short aCatType, [optional] in nsIArray items, [optional] in AString catName);
+
+  /**
+   * Aborts and clears the current jump list build.
+   */
+  void abortListBuild();
+
+  /**
+   * Commits the current jump list build to the Taskbar.
+   *
+   * @param callback
+   *        Receives one argument, which is true if the operation completed
+   *        successfully, otherwise it is false.
+   */
+  void commitListBuild([optional] in nsILegacyJumpListCommittedCallback callback);
+
+  /**
+   * Deletes any currently applied taskbar jump list for this application.
+   * Common uses would be the enabling of a privacy mode and uninstallation.
+   *
+   * @returns true if the operation completed successfully.
+   *
+   * @throw NS_ERROR_UNEXPECTED on internal errors.
+   */
+  boolean deleteActiveList();
+
+  void setAppUserModelID(in AString aAppUserModelId);
+};