# File lib/mobileesp_converted/user_agent_info.rb, line 955
    def detect_firefox_o_s_phone()

      if (detect_ios() || detect_android() || detect_sailfish())
        return false
      end

      if ((user_agent.include?(ENGINE_FIREFOX)) && (user_agent.include?(MOBILE)))
        return true
      end

      return false
    end