Turn on DOH in Firefox!

DOH DNS over HTTPS in Firefox

about:support

Check version

about:config

network.trr.mode 2 or 3

network.trr.uri

https://mozilla.cloudflare-dns.com/dns-query

https://dns.google.com/experimental

network.trr.bootstrapAddress

1.1.1.1

8.8.8.8

about:networking

dns