2

Why is mode 3 required on Firefox?

The TTR mode 3 of Firefox guarantees the browser won’t fallback on system DNS when a response cannot be obtained through DNS over HTTPS. Because NextDNS blocks some DNS requests based on the blocklist you configured, other modes like mode 2 would make those blocks ineffective and would leak some DNS traffic.

1 reply

null
    • f2bhxs_czmk2
    • 1 yr ago
    • Reported - view

    This can be changed by going to about:config and changing network.trr.mode from 2 to 3. Should probably be in the setup details.

Login to reply

Content aside

Related Articles
How to download logs?
Affiliation Program
What is DNS?
What is DNS over TLS (DoT), DNS over Quic (DoQ) and DNS over HTTPS (DoH & DoH3)?
What is Linked IP
What happens after 300k queries?
What is a malware?
Does NextDNS collect and store personal data?
Does NextDNS share the DNS data that is generated?
What is phishing?
Will NextDNS filter content?
How is NextDNS different from traditional adblockers?
Why is mode 3 required on Firefox?
What is Anycast?
What is DNS Rebinding Protection?
Why is DNSSEC % of queries so low?
How to customize the upstream resolver?
What A and AAAA labels mean in the logs?
What is the advantage of using NextDNS over Pi-hole®?
What is Handshake?
What is EDNS Client-Subnet (ECS)?
Translations
Who is behind NextDNS?
Which setup type to use?
How to get help or report issues?