new_contents: """ SeleniumBase Exceptions
      NoSuchFileException => Used by self.assert_downloaded_file(...)
      TimeLimitExceededException => Used by "--time-limit=SECONDS"
  """
  
  
  class NoSuchFileException(Exception):
      pass
  
  
  class TimeLimitExceededException(Exception):
      pass
  
subject: Add SeleniumBase custom exceptions