rem: Components.interfaces.nsISupportsWString).data; 
add: Components.interfaces.nsISupportsString).data; 
context:   copyUnicharPref: function (aPrefName, aDefVal)    {      try        {          return this.mPrefService.getComplexValue(aPrefName,                                                   Components.interfaces.nsISupportsWString).data;        }      catch(e)        {          return aDefVal != undefined ? aDefVal : null;        }      return null;        // quiet warnings    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/3703f3c61bce0c45d03ff380dc6b806f944ecb73/nsUserSettings.js/buggy/xpfe/global/resources/content/nsUserSettings.js