public function closeBrowser()
 {
     if ($this->webDriver) {
         $this->webDriver->close();
         $this->webDriver = null;
     }
 }
 public function close()
 {
     try {
         parent::close();
     } catch (UnknownServerException $e) {
         // Sometimes webdriver loses connection with with browser.
         // We don't need the browser anymore. yolo
     }
 }