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diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/app-strings.js b/tools/addon-sdk-1.3/packages/api-utils/lib/app-strings.js
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+/* ***** 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 String Bundle.
+ *
+ * The Initial Developer of the Original Code is Mozilla.
+ * Portions created by the Initial Developer are Copyright (C) 2008
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Myk Melez <myk@mozilla.org>
+ *
+ * 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";
+
+const {Cc,Ci} = require("chrome");
+const apiUtils = require("./api-utils");
+
+/**
+ * A bundle of strings.
+ *
+ * @param url {String}
+ *        the URL of the string bundle
+ */
+exports.StringBundle = apiUtils.publicConstructor(function StringBundle(url) {
+
+  let stringBundle = Cc["@mozilla.org/intl/stringbundle;1"].
+                     getService(Ci.nsIStringBundleService).
+                     createBundle(url);
+
+  this.__defineGetter__("url", function () url);
+
+  /**
+   * Get a string from the bundle.
+   *
+   * @param name {String}
+   *        the name of the string to get
+   * @param args {array} [optional]
+   *        an array of arguments that replace occurrences of %S in the string
+   *
+   * @returns {String} the value of the string
+   */
+  this.get = function strings_get(name, args) {
+    try {
+      if (args)
+        return stringBundle.formatStringFromName(name, args, args.length);
+      else
+        return stringBundle.GetStringFromName(name);
+    }
+    catch(ex) {
+      // f.e. "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE)
+      // [nsIStringBundle.GetStringFromName]"
+      throw new Error("String '" + name + "' could not be retrieved from the " +
+                      "bundle due to an unknown error (it doesn't exist?).");
+    }
+  },
+
+  /**
+   * Iterate the strings in the bundle.
+   *
+   */
+  apiUtils.addIterator(
+    this,
+    function keysValsGen() {
+      let enumerator = stringBundle.getSimpleEnumeration();
+      while (enumerator.hasMoreElements()) {
+        let elem = enumerator.getNext().QueryInterface(Ci.nsIPropertyElement);
+        yield [elem.key, elem.value];
+      }
+    }
+  );
+});