docs: function doFeta(msg) {
              if(msg){
                runInPage(window.fetaSource.startStr(),
                  function(){
                    btn.update("images/recording.png", "Stop Recording");
                  });
              }else{
                runInPage(window.fetaSource.stopStr(),
                  function(result){
                     btn.update("images/record.png", "Start Recording");
                     _window.msgFromDevtools("saveFile",{data:result});
                   });
              }
          }