code: def _open_url(self):
          
          load_text = "Loading URL..." if not self.run else "Executing: {}".format(self.run)
          if os.environ.get('BROWSER') not in ['elinks', 'links', 'w3m', 'lynx']:
              self._footer_start_thread(load_text, 5)
docs: <Enter> or <space>