https://blog.wongcw.com/2018/10/16/mozilla%e7%bb%88%e4%ba%8e%e5%9c%a8firefox%e4%b8%ad%e6%b7%bb%e5%8a%a0%e4%ba%86%e5%af%b9mailto%e9%93%be%e6%8e%a5%e7%9a%84%e6%94%af%e6%8c%81/