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diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/collection.js b/tools/addon-sdk-1.3/packages/api-utils/lib/collection.js
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+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Drew Willcoxon <adw@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";
+
+exports.Collection = Collection;
+
+/**
+ * Adds a collection property to the given object.  Setting the property to a
+ * scalar value empties the collection and adds the value.  Setting it to an
+ * array empties the collection and adds all the items in the array.
+ *
+ * @param obj
+ *        The property will be defined on this object.
+ * @param propName
+ *        The name of the property.
+ * @param array
+ *        If given, this will be used as the collection's backing array.
+ */
+exports.addCollectionProperty = function addCollProperty(obj, propName, array) {
+  array = array || [];
+  let publicIface = new Collection(array);
+
+  obj.__defineSetter__(propName, function (itemOrItems) {
+    array.splice(0, array.length);
+    publicIface.add(itemOrItems);
+  });
+
+  obj.__defineGetter__(propName, function () {
+    return publicIface;
+  });
+};
+
+/**
+ * A collection is ordered, like an array, but its items are unique, like a set.
+ *
+ * @param array
+ *        The collection is backed by an array.  If this is given, it will be
+ *        used as the backing array.  This way the caller can fully control the
+ *        collection.  Otherwise a new empty array will be used, and no one but
+ *        the collection will have access to it.
+ */
+function Collection(array) {
+  array = array || [];
+
+  /**
+   * Provides iteration over the collection.  Items are yielded in the order
+   * they were added.
+   */
+  this.__iterator__ = function Collection___iterator__() {
+    let items = array.slice();
+    for (let i = 0; i < items.length; i++)
+      yield items[i];
+  };
+
+  /**
+   * The number of items in the collection.
+   */
+  this.__defineGetter__("length", function Collection_get_length() {
+    return array.length;
+  });
+
+  /**
+   * Adds a single item or an array of items to the collection.  Any items
+   * already contained in the collection are ignored.
+   *
+   * @param  itemOrItems
+   *         An item or array of items.
+   * @return The collection.
+   */
+  this.add = function Collection_add(itemOrItems) {
+    let items = toArray(itemOrItems);
+    for (let i = 0; i < items.length; i++) {
+      let item = items[i];
+      if (array.indexOf(item) < 0)
+        array.push(item);
+    }
+    return this;
+  };
+
+  /**
+   * Removes a single item or an array of items from the collection.  Any items
+   * not contained in the collection are ignored.
+   *
+   * @param  itemOrItems
+   *         An item or array of items.
+   * @return The collection.
+   */
+  this.remove = function Collection_remove(itemOrItems) {
+    let items = toArray(itemOrItems);
+    for (let i = 0; i < items.length; i++) {
+      let idx = array.indexOf(items[i]);
+      if (idx >= 0)
+        array.splice(idx, 1);
+    }
+    return this;
+  };
+};
+
+function toArray(itemOrItems) {
+  let isArr = itemOrItems &&
+              itemOrItems.constructor &&
+              itemOrItems.constructor.name === "Array";
+  return isArr ? itemOrItems : [itemOrItems];
+}