https://blog.wongcw.com/2019/09/07/mozilla-firefox%e9%bb%98%e8%aa%8d%e5%9c%a8%e7%be%8e%e5%9c%8b%e5%95%9f%e7%94%a8dns-over-https%ef%bc%88doh%ef%bc%89/
Mozilla Firefox默認在美國啟用DNS over HTTPS(DoH)