text: 
  import selenium.webdriver.emulation.base as base
  
  class open(base.BaseCommand):
    def __call__(self, url):
      if url.find("://") == -1:
        if url.startswith('/'):
          toLoad = self.baseUrl + url
        else:
          toLoad = "%s/%s" % (self.baseUrl, url)
      else:
        toLoad = url
      self.driver.get(toLoad)
      
  class go_back(base.BaseCommand):
    def __call__(self):
      self.driver.back()
  
  class stop(base.BaseCommand):
    def __call__(self  , *args, **kwargs):
      self.driver.quit()