https://blog.wongcw.com/2020/06/30/firefox-78%e7%a9%a9%e5%ae%9a%e7%89%88%e7%99%bc%e5%b8%83%ef%bc%9a%e5%8d%b8%e8%bc%89%e5%99%a8%e6%96%b0%e5%a2%9e%e5%88%b7%e6%96%b0%e6%8c%89%e9%88%95%e5%85%a7%e7%bd%aepdf%e9%96%b1%e8%ae%80%e5%99%a8/