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diff --git a/mailnews/base/util/StringBundle.js b/mailnews/base/util/StringBundle.js
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+++ b/mailnews/base/util/StringBundle.js
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+/* 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/. */
+
+this.EXPORTED_SYMBOLS = ["StringBundle"];
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+/**
+ * A string bundle.
+ *
+ * This object presents two APIs: a deprecated one that is equivalent to the API
+ * for the stringbundle XBL binding, to make it easy to switch from that binding
+ * to this module, and a new one that is simpler and easier to use.
+ *
+ * The benefit of this module over the XBL binding is that it can also be used
+ * in JavaScript modules and components, not only in chrome JS.
+ *
+ * To use this module, import it, create a new instance of StringBundle,
+ * and then use the instance's |get| and |getAll| methods to retrieve strings
+ * (you can get both plain and formatted strings with |get|):
+ *
+ *   let strings =
+ *     new StringBundle("chrome://example/locale/strings.properties");
+ *   let foo = strings.get("foo");
+ *   let barFormatted = strings.get("bar", [arg1, arg2]);
+ *   for (let string of strings.getAll())
+ *     dump (string.key + " = " + string.value + "\n");
+ *
+ * @param url {String}
+ *        the URL of the string bundle
+ */
+function StringBundle(url) {
+  this.url = url;
+}
+
+StringBundle.prototype = {
+  /**
+   * the locale associated with the application
+   * @type nsILocale
+   * @private
+   */
+  get _appLocale() {
+    try {
+      return Services.locale.getApplicationLocale();
+    }
+    catch(ex) {
+      return null;
+    }
+  },
+
+  /**
+   * the wrapped nsIStringBundle
+   * @type nsIStringBundle
+   * @private
+   */
+  get _stringBundle() {
+    let stringBundle = Services.strings.createBundle(this.url, this._appLocale);
+    this.__defineGetter__("_stringBundle", () => stringBundle);
+    return this._stringBundle;
+  },
+
+
+  // the new API
+
+  /**
+   * the URL of the string bundle
+   * @type String
+   */
+  _url: null,
+  get url() {
+    return this._url;
+  },
+  set url(newVal) {
+    this._url = newVal;
+    delete this._stringBundle;
+  },
+
+  /**
+   * Get a string from the bundle.
+   *
+   * @param key {String}
+   *        the identifier 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
+   */
+  get: function(key, args) {
+    if (args)
+      return this.stringBundle.formatStringFromName(key, args, args.length);
+    else
+      return this.stringBundle.GetStringFromName(key);
+  },
+
+  /**
+   * Get all the strings in the bundle.
+   *
+   * @returns {Array}
+   *          an array of objects with key and value properties
+   */
+  getAll: function() {
+    let strings = [];
+
+    // FIXME: for performance, return an enumerable array that wraps the string
+    // bundle's nsISimpleEnumerator (does JavaScript already support this?).
+
+    let enumerator = this.stringBundle.getSimpleEnumeration();
+
+    while (enumerator.hasMoreElements()) {
+      // We could simply return the nsIPropertyElement objects, but I think
+      // it's better to return standard JS objects that behave as consumers
+      // expect JS objects to behave (f.e. you can modify them dynamically).
+      let string = enumerator.getNext()
+        .QueryInterface(Components.interfaces.nsIPropertyElement);
+      strings.push({ key: string.key, value: string.value });
+    }
+
+    return strings;
+  },
+
+
+  // the deprecated XBL binding-compatible API
+
+  /**
+   * the URL of the string bundle
+   * @deprecated because its name doesn't make sense outside of an XBL binding
+   * @type String
+   */
+  get src() {
+    return this.url;
+  },
+  set src(newVal) {
+    this.url = newVal;
+  },
+
+  /**
+   * the locale associated with the application
+   * @deprecated because it has never been used outside the XBL binding itself,
+   * and consumers should obtain it directly from the locale service anyway.
+   * @type nsILocale
+   */
+  get appLocale() {
+    return this._appLocale;
+  },
+
+  /**
+   * the wrapped nsIStringBundle
+   * @deprecated because this module should provide all necessary functionality
+   * @type nsIStringBundle
+   *
+   * If you do ever need to use this, let the authors of this module know why
+   * so they can surface functionality for your use case in the module itself
+   * and you don't have to access this underlying XPCOM component.
+   */
+  get stringBundle() {
+    return this._stringBundle;
+  },
+
+  /**
+   * Get a string from the bundle.
+   * @deprecated use |get| instead
+   *
+   * @param key {String}
+   *        the identifier of the string to get
+   *
+   * @returns {String}
+   *          the value of the string
+   */
+  getString: function(key) {
+    return this.get(key);
+  },
+
+  /**
+   * Get a formatted string from the bundle.
+   * @deprecated use |get| instead
+   *
+   * @param key {string}
+   *        the identifier of the string to get
+   * @param args {array}
+   *        an array of arguments that replace occurrences of %S in the string
+   *
+   * @returns {String}
+   *          the formatted value of the string
+   */
+  getFormattedString: function(key, args) {
+    return this.get(key, args);
+  }
+}