https://blog.wongcw.com/2019/03/13/mozilla%e4%b8%8a%e7%b7%9afirefox-send%e6%96%87%e4%bb%b6%e5%ae%89%e5%85%a8%e5%85%b1%e4%ba%ab%e6%9c%8d%e5%8b%99/