code: function(){
  			var d = new Deferred();
  			this._preferenceService.get(this._prefix, undefined, {scope: 2}).then(
  				function(pref){
  					var settings = pref["settings"];
  					if(settings === undefined){
  						d.resolve(false);
  						return;
  					}
  					
  					d.resolve(settings.enabled);
  				}
  			);
  			
  			return d;
  		}
docs: Determines whether the storage is enabled by the user or not.