Issue 1663 - Various Firefox-related changes of the first-run page

i18n.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 // This variable should no longer be necessary once options.js in Chrome
 // accesses ext.i18n directly.
 var i18n = ext.i18n;
 
-if (ext.i18n.noSpecialMessages)
+if (ext.i18n.getMessage("@@ui_locale"))
 {
+  document.documentElement.lang = ext.i18n.getMessage("@@ui_locale").replace(/_/g, "-");
+  document.documentElement.dir = ext.i18n.getMessage("@@bidi_dir");
+}
+else
+{
+  // Getting UI locale cannot be done synchronously on Firefox, requires
+  // messaging the background page.
   ext.backgroundPage.sendMessage({
     type: "app.get",
     what: "localeInfo"
   }, function(localeInfo)
   {
     document.documentElement.lang = localeInfo.locale;
     document.documentElement.dir = localeInfo.isRTL ? "rtl" : "ltr";
   });
-}
-else
-{
-  document.documentElement.lang = ext.i18n.getMessage("@@ui_locale").replace(/_/g, "-");
-  document.documentElement.dir = ext.i18n.getMessage("@@bidi_dir");
 }
 
 // Inserts i18n strings into matching elements. Any inner HTML already in the element is
 // parsed as JSON and used as parameters to substitute into placeholders in the i18n
 // message.
 ext.i18n.setElementText = function(element, stringName, arguments)
 {
   function processString(str, element)
   {
     var match = /^(.*?)<(a|strong)>(.*?)<\/\2>(.*)$/.exec(str);
@@ skipping 44 matching lines @@
 
   var now = new Date();
   if (d.toDateString() == now.toDateString())
     return [timeString];
   else
     return [timeString, d.toLocaleDateString()];
 }
 
 // Fill in the strings as soon as possible
 window.addEventListener("DOMContentLoaded", loadI18nStrings, true);