rem: get prefService() 
add: get Sanitizer() 
context:   get prefService()  {    if (!this.mPrefService)       this.mPrefService =                   Components.classes["@mozilla.org/preferences-service;1"]                             .getService(Components.interfaces.nsIPrefBranch2);    return this.mPrefService;  },
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/1b459d8d0dcb1d5ef432f51cf697e8ab9bed8c83/nsBrowserGlue.js/buggy/browser/components/nsBrowserGlue.js