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: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/f7ad4265ef6a40ea01c54009718ef28974e67fe9/nsUserSettings.js/clean/xpfe/global/resources/content/nsUserSettings.js