Index: qunit/tests/prefs.js
===================================================================
--- a/qunit/tests/prefs.js
+++ b/qunit/tests/prefs.js
@@ -1,11 +1,10 @@
 "use strict";
 
-(function()
 {
   const {Prefs} = require("prefs");
 
   module("Preferences", {
     setup()
     {
       this._pbackup = Object.create(null);
       for (let pref in Prefs)
@@ -155,9 +154,9 @@
     delete Prefs.notificationdata.bar;
     Prefs.notificationdata = JSON.parse(JSON.stringify(Prefs.notificationdata));
     deepEqual(
       Prefs.notificationdata, {},
       "Prefs object returns the correct value after setting pref to " +
       "default value"
     );
   });
-}());
+}