DNS over HTTPS not working in FF 66 (MacOS)

DNS over HTTPS not working in Firefox 66. I am from Russia. There is my settings:

network.trr.mode = 2
network.trr.uri = https://mozilla.cloudflare-dns.com/dns-query
network.trr.bootstrapAddress =

Test results:

I am set and into my router settings too (DHCP/WAN):

If I am set network.trr.mode to 3 I am can’t open any pages because internet connection going to very slow. If I am set network.trr.mode to 1 all tests will be passed, but after reloading the page only 2 tests (DNSSEC and TLS) passes again.


Does Firefox work for you in DNS/HTTP2 if you use other DNS servers in your router? I understand having Cloudflare DNS Servers set in your router is very convenient, however, as a temp fix, does it work? It would also help in debugging your setup. Or lookup on Mozilla’s bugs list and see if anything is affecting you, peace :peace_symbol:

I am set TRR mode to 3 and DoH works great now