rem: this.mPrefService.SetBoolPref(aPrefName, aPrefValue); 
add: this.mPrefService.setBoolPref(aPrefName, aPrefValue); 
context:   setBoolPref: function (aPrefName, aPrefValue)    {      try         {          this.mPrefService.SetBoolPref(aPrefName, aPrefValue);        }      catch(e)        {        }    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f1f4e0d7a57ab7bc6d826daa2e6141efd69e1dce/nsUserSettings.js/clean/xpfe/global/resources/content/nsUserSettings.js