@classmethod
def userAgentsManager(cls):
    """
        Class method to get a reference to the user agents manager.
        
        @return reference to the user agents manager (UserAgentManager)
        """
    if cls._userAgentsManager is None:
        from .UserAgent.UserAgentManager import UserAgentManager
        cls._userAgentsManager = UserAgentManager()
    return cls._userAgentsManager
