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diff --git a/tools/addon-sdk-1.4/packages/api-utils/lib/array.js b/tools/addon-sdk-1.4/packages/api-utils/lib/array.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";
+
+/**
+ * Returns `true` if given `array` contain given `element` or `false`
+ * otherwise.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element being looked up.
+ * @returns {Boolean}
+ */
+var has = exports.has = function has(array, element) {
+  // shorter and faster equivalent of `array.indexOf(element) >= 0`
+  return !!~array.indexOf(element);
+};
+
+/**
+ * Adds given `element` to the given `array` if it does not contain it yet.
+ * `true` is returned if element was added otherwise `false` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be added.
+ * @returns {Boolean}
+ */
+var add = exports.add = function add(array, element) {
+  var result;
+  if ((result = !has(array, element)))
+    array.push(element);
+
+  return result;
+};
+
+/**
+ * Removes first occurrence of the given `element` from the given `array`. If
+ * `array` does not contain given `element` `false` is returned otherwise
+ * `true` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be removed.
+ * @returns {Boolean}
+ */
+exports.remove = function remove(array, element) {
+  var result;
+  if ((result = has(array, element)))
+    array.splice(array.indexOf(element), 1);
+
+  return result;
+};
+
+/**
+ * Produces a duplicate-free version of the given `array`.
+ * @param {Array} array
+ *    Source array.
+ * @returns {Array}
+ */
+exports.unique = function unique(array) {
+  var value = [];
+  return array.forEach(function(element) {
+    add(value, element);
+  });
+  return value;
+};