rem: Components.interfaces.nsISupportsWString); 
add: Components.interfaces.nsISupportsWString).data; 
context:   copyUnicharPref: function (aPrefName, aDefVal)    {      try        {          return this.mPrefService.getComplexValue(aPrefName,                                                   Components.interfaces.nsISupportsWString);        }      catch(e)        {          return aDefVal != undefined ? aDefVal : null;        }      return null;        // quiet warnings    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/aa65825ca918a7de801deee2c11e3ddb0889e209/nsUserSettings.js/buggy/xpfe/global/resources/content/nsUserSettings.js