handlerInfoWrapper.handledOnlyByPlugin = true; 
  _loadPluginHandlers: function() {    for (let i = 0; i < navigator.plugins.length; ++i) {      let plugin = navigator.plugins[i];      for (let j = 0; j < plugin.length; ++j) {        let type = plugin[j].type;        let handlerInfoWrapper;        if (typeof this._handledTypes[type] == "undefined") {          let wrappedHandlerInfo =            this._mimeSvc.getFromTypeAndExtension(type, null);          handlerInfoWrapper = new HandlerInfoWrapper(type, wrappedHandlerInfo);          this._handledTypes[type] = handlerInfoWrapper;        }        else          handlerInfoWrapper = this._handledTypes[type];        handlerInfoWrapper.plugin = plugin;        handlerInfoWrapper.handledOnlyByPlugin = true;      }    }  },
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/1171d45a4e94e20eb007a51592d731dc434c5f90/applications.js/clean/browser/components/preferences/applications.js