rem: this.mPrefs = XPCU.getService("@mozilla.org/preferences;1", "nsIPref"); 
add: var prefService = XPCU.getService("@mozilla.org/preferences-service;1", "nsIPrefService"); this.mPrefs = prefService.getBranch(null); 
context:   init: function()  {    this.mPrefs = XPCU.getService("@mozilla.org/preferences;1", "nsIPref");  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/8403e03f3bdc8feaf5cc5f31884e180a04c93a26/PrefUtils.js/clean/extensions/inspector/resources/content/jsutil/system/PrefUtils.js