https://blog.wongcw.com/2019/10/13/mozilla%ef%bc%9afirefox-71%e9%96%8b%e5%a7%8b%e5%85%81%e8%a8%b1%e7%94%a8%e6%88%b6%e6%9b%b4%e6%94%b9%e9%9a%b1%e7%a7%81%e6%a8%a1%e5%bc%8f%e9%bb%98%e8%aa%8d%e6%90%9c%e7%b4%a2%e5%bc%95%e6%93%8e/