https://blog.wongcw.com/2022/01/19/firefox-relay%e9%9a%b1%e7%a7%81%e9%83%b5%e4%bb%b6%e4%b8%ad%e7%b9%bc%e5%9f%9f%e5%90%8d%e8%a2%ab%e6%8b%89%e5%85%a5%e9%bb%91%e5%90%8d%e5%96%ae%e5%bc%95%e7%99%bc%e7%b6%b2%e5%8f%8b/