2019/09/24

How to enable ESNI and DOH in Firefox

Checkout Firefox Nightly.

Now go to about:config and do changes:

network.security.esni.enabled=true
network.trr.uri=https://mozilla.cloudflare-dns.com/dns-query
network.trr.mode=2

DOH Servers

  • Mozilla: https://mozilla.cloudflare-dns.com/dns-query
  • Google DNS: https://dns.google.com/experimental
  • Quad9: https://dns.quad9.net/dns-query

Trusted Recursive Resolver mode values

0: Off by default
1: Firefox will choose based on which is faster
2: TRR preferred, fall back to DNS on failure
3: TRR only, no DNS fallback
5: TRR completely disabled

Checkout https://www.cloudflare.com/ssl/encrypted-sni and check DNS you're using

To check if domain support ESNI do

dig @8.8.8.8 IN TXT _esni.domain.tld

IETF changes RRType for that feature - IN ESNI instead of IN TXT. Keep this in mind in the future.

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