Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -12,17 +12,16 @@
  * 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/>.
  */
 
 "use strict";
 
-(function()
 {
   let nonEmptyPageMaps = new Set();
 
   let PageMap = ext.PageMap = function()
   {
     this._map = new Map();
   };
   PageMap.prototype = {
@@ -676,9 +675,9 @@
     create(createData, callback)
     {
       browser.windows.create(createData, createdWindow =>
       {
         afterTabLoaded(callback)(createdWindow.tabs[0]);
       });
     }
   };
-}());
+}