Returns True if there are multiple domains in the jar.
        Returns False otherwise.

        :rtype: bool

def multiple_domains(self):
        """Returns True if there are multiple domains in the jar.
        Returns False otherwise.

        :rtype: bool
        """
        domains = []
        for cookie in iter(self):
            if cookie.domain is not None and cookie.domain in domains:
                return True
            domains.append(cookie.domain)
        return False