add: realValue = value; 
context:     function prefSetter (value)    {        try        {                switch (typeof value)            {                case "int":                    this.prefBranch.setIntPref (prefName, value);                    break;                                    case "boolean":                    this.prefBranch.setBoolPref (prefName, value);                    break;                                    default:                    this.prefBranch.setCharPref (prefName, value);                    break;                   }            this.prefService.savePrefFile(null);        }        catch (ex)        {            dd ("caught exception writing pref ``" + prefName + "''\n" + ex);        }        return value;    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/ed4fc243ec2ff99e9bc6edcf70a934c38a68c746/venkman-prefs.js/clean/extensions/venkman/resources/content/venkman-prefs.js