* Vector.im is the identity server that gets restored by itself and I
don't seem to ever have any business to Vector.im website, while
the other domains I need to visit at times.
* use-application-dns.net being NXDOMAIN tells Firefox to not send
traffic to Cloudflare DoH. I thought of this when I saw the news and
got courage to actually do this after seeing that DNSCrypt-proxy also
does so.