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This is described in more detail here: https://support.mozilla.org/en-US/kb/configuring-networks-disable-dns-over-https https://support.mozilla.org/en-US/kb/con

by sltkr 5y ago

This is described in more detail here: https://support.mozilla.org/en-US/kb/configuring-networks-disable-dns-over-https https://support.mozilla.org/en-US/kb/configuring-networks-di... Part of it is doing a test DNS query to a canary domain to see if it's intercepted, but the domain is use-application-dns.net, not an actual adult domain.

billpg 5y ago
Why would a parental filter modify or otherwise interfere with use-application-dns.net? I'd have thought a filter would pick up the DNS request, see that it isn't on the list of adult-only domains and pass the request along.
- madeofpalk 5y ago
  I imagine the idea is that any DNS-based filtering tech would also block use-application-dns.net. An ad-hoc spec. Kind of like how captive wifi portals "block" (or allow) canary domains like captive.apple.com so the OS throws the captive portal login dialogue.