code: def launch_browser(self, soup=None):
          
          if soup is None:
              soup = self.get_current_page()
          super(StatefulBrowser, self).launch_browser(soup)
docs: Launch a browser to display a page, for debugging purposes.
  
          :param: soup: Page contents to display, supplied as a bs4 soup object.
              Defaults to the current page of the ``StatefulBrowser`` instance.