see https://support.mozilla.org/en-US/kb/firefox-dns-over-https#w_manually-enabling-and-disabling-dns-over-https https://support.mozilla.org/en-US/kb/firefox-dn

see https://support.mozilla.org/en-US/kb/firefox-dns-over-https#w_manually-enabling-and-disabling-dns-over-https https://support.mozilla.org/en-US/kb/firefox-dns-over-https#... edit: there is also the canary domain https://news.ycombinator.com/item?id=21825443 https://news.ycombinator.com/item?id=21825443