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diff --git a/tools/addon-sdk-1.4/packages/api-utils/lib/dom/events.js b/tools/addon-sdk-1.4/packages/api-utils/lib/dom/events.js
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+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is
+ * the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Irakli Gozalishvili <gozala@mozilla.com> (Original Author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+// Utility function that returns copy of the given `text` with last character
+// removed if it is `"s"`.
+function singularify(text) {
+  return text[text.length - 1] === "s" ? text.substr(0, text.length - 1) : text;
+}
+
+// Utility function that takes event type, argument is passed to
+// `document.createEvent` and returns name of the initializer method of the
+// given event. Please note that there are some event types whose initializer
+// methods can't be guessed by this function. For more details see following
+// link: https://developer.mozilla.org/En/DOM/Document.createEvent
+function getInitializerName(category) {
+  return "init" + singularify(category);
+}
+
+/**
+ * Registers an event `listener` on a given `element`, that will be called
+ * when events of specified `type` is dispatched on the `element`.
+ * @param {Element} element
+ *    Dom element to register listener on.
+ * @param {String} type
+ *    A string representing the
+ *    [event type](https://developer.mozilla.org/en/DOM/event.type) to
+ *    listen for.
+ * @param {Function} listener
+ *    Function that is called whenever an event of the specified `type` 
+ *    occurs.
+ * @param {Boolean} capture
+ *    If true, indicates that the user wishes to initiate capture. After
+ *    initiating capture, all events of the specified type will be dispatched
+ *    to the registered listener before being dispatched to any `EventTarget`s
+ *    beneath it in the DOM tree. Events which are bubbling upward through
+ *    the tree will not trigger a listener designated to use capture.
+ *    See [DOM Level 3 Events](http://www.w3.org/TR/DOM-Level-3-Events/#event-flow)
+ *    for a detailed explanation.
+ */
+function on(element, type, listener, capture) {
+  // `capture` defaults to `false`.
+  capture = capture || false;
+  element.addEventListener(type, listener, capture);
+}
+exports.on = on;
+
+/**
+ * Registers an event `listener` on a given `element`, that will be called
+ * only once, next time event of specified `type` is dispatched on the
+ * `element`.
+ * @param {Element} element
+ *    Dom element to register listener on.
+ * @param {String} type
+ *    A string representing the
+ *    [event type](https://developer.mozilla.org/en/DOM/event.type) to
+ *    listen for.
+ * @param {Function} listener
+ *    Function that is called whenever an event of the specified `type` 
+ *    occurs.
+ * @param {Boolean} capture
+ *    If true, indicates that the user wishes to initiate capture. After
+ *    initiating capture, all events of the specified type will be dispatched
+ *    to the registered listener before being dispatched to any `EventTarget`s
+ *    beneath it in the DOM tree. Events which are bubbling upward through
+ *    the tree will not trigger a listener designated to use capture.
+ *    See [DOM Level 3 Events](http://www.w3.org/TR/DOM-Level-3-Events/#event-flow)
+ *    for a detailed explanation.
+ */
+function once(element, type, listener, capture) {
+  on(element, type, function selfRemovableListener(event) {
+    removeListener(element, type, selfRemovableListener, capture);
+    listener.apply(this, arguments);
+  }, capture);
+}
+exports.once = once;
+
+/**
+ * Unregisters an event `listener` on a given `element` for the events of the
+ * specified `type`.
+ *
+ * @param {Element} element
+ *    Dom element to unregister listener from.
+ * @param {String} type
+ *    A string representing the
+ *    [event type](https://developer.mozilla.org/en/DOM/event.type) to
+ *    listen for.
+ * @param {Function} listener
+ *    Function that is called whenever an event of the specified `type` 
+ *    occurs.
+ * @param {Boolean} capture
+ *    If true, indicates that the user wishes to initiate capture. After
+ *    initiating capture, all events of the specified type will be dispatched
+ *    to the registered listener before being dispatched to any `EventTarget`s
+ *    beneath it in the DOM tree. Events which are bubbling upward through
+ *    the tree will not trigger a listener designated to use capture.
+ *    See [DOM Level 3 Events](http://www.w3.org/TR/DOM-Level-3-Events/#event-flow)
+ *    for a detailed explanation.
+ */
+function removeListener(element, type, listener, capture) {
+  element.removeEventListener(type, listener, capture);
+}
+exports.removeListener = removeListener;
+
+/**
+ * Emits event of the specified `type` and `category` on the given `element`.
+ * Specified `settings` are used to initialize event before dispatching it.
+ * @param {Element} element
+ *    Dom element to dispatch event on.
+ * @param {String} type
+ *    A string representing the
+ *    [event type](https://developer.mozilla.org/en/DOM/event.type).
+ * @param {Object} options
+ *    Options object containing following properties:
+ *    - `category`: String passed to the `document.createEvent`. Option is
+ *      optional and defaults to "UIEvents".
+ *    - `initializer`: If passed it will be used as name of the method used
+ *      to initialize event. If omitted name will be generated from the
+ *      `category` field by prefixing it with `"init"` and removing last
+ *      character if it matches `"s"`.
+ *    - `settings`: Array of settings that are forwarded to the event
+ *      initializer after firs `type` argument.
+ * @see https://developer.mozilla.org/En/DOM/Document.createEvent
+ */
+function emit(element, type, { category, initializer, settings }) {
+  category = category || "UIEvents";
+  initializer = initializer || getInitializerName(category);
+  let document = element.ownerDocument;
+  let event = document.createEvent(category);
+  event[initializer].apply(event, [type].concat(settings));
+  element.dispatchEvent(event);
+};
+exports.emit = emit;