rem: if (!this.mPrefService) this.mPrefService = Components.classes["@mozilla.org/preferences-service;1"] .getService(Components.interfaces.nsIPrefBranch2);  return this.mPrefService; 
add: if(typeof(Sanitizer) != "function") { Components.classes["@mozilla.org/moz/jssubscript-loader;1"] .getService(Components.interfaces.mozIJSSubScriptLoader) .loadSubScript("chrome: } return Sanitizer; 
context:   get prefService()  {    if (!this.mPrefService)       this.mPrefService =                   Components.classes["@mozilla.org/preferences-service;1"]                             .getService(Components.interfaces.nsIPrefBranch2);    return this.mPrefService;  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f438aca260c190a03f9093d005e0f5bafda4ddd7/nsBrowserGlue.js/buggy/browser/components/nsBrowserGlue.js