DNS Security and Privacy check

Cloudflare has a tool to check your browser security and privacy against potential attacks that has to do with DNS.

With Firefox 64, is very simple to get all the tests green. Open about:config

Set the following properties:

network.trr.mode: 1
network.security.esni.enabled: true

Done :)

No need to restart. Run the Cloudflare test again and will be all green.

Sources: Encrypted SNI and Improved privacy in Firefox articles from Mozilla blog.

Updated Jan 14, 2019: I noticed that the proper value for network.trr.mode is 1, not 2 as reported in the Mozilla blog and in the original version of this post. Probably something changed from the nightly and the last stable release.