I found the option to enable DNS over HTTPS for Firefox on the desktop but I can't find it on the Android version of the browser. Is it supported? How do I enable it?


I try to complete Dale answer

  • Open Firefox and type: about:config

  • filter with: network.trr.* and set the following values:

    network.trr.mode value 3

    network.trr.bootstrapAddress and set value as one ip from this page (mine value is currently

  • now open a new tab to this page used to verify if everything is working. You should have all green except sni. To make all green you should

  • switch tab and go back to config page

  • change filter with: network.security.* and set:

    network.security.esni.enabled value true

  • go back to previous tab and refresh. You should have all green.


  • I needed this because my mobile data DNS is failing for some addresses. After setting network.trr.mode=3 and network.trr.bootstrapAddress= it works! Thanks! – krubo Jan 9 '20 at 0:34
  • Awesome answer. – Shashwat Kumar Apr 8 '20 at 16:04
  • This seems either outdated or wrong. Typing about:config in Firefox Android does nothing (the contents of the view does not change) – Romuald Brunet Apr 26 at 15:09
  • @RomualdBrunet you have to use firefox nightly version app for android to be able to access the config page – Zen Apr 29 at 15:19

Although I have not been able to prove it's really changing the routing of DNS queries, I have changed the settings on Firefox for Android: network.trr.mode to 2 (fail-over enabled) or 3 (fail-over not enabled) and network.trr.uri to (Cloudflare) or (Google) or (Quad9). This came from this Mozilla page (not specific to Android Firefox). So you type about:config in the address bar, then search for and change the network.trr* settings.

But as mentioned by Irfan, you can have all your DNS go to cloudflare by using their app, or if you're on the Android Pie, you can go to Settings > Network & Internet > Private DNS and select Automatic (I'm sure that's GOT to be Google's or Private DNS provider hostname with 1dot1dot1dot1.cloudflare-dns.com, for instance (credit to this page on TechRepublic).

  • 2
    You'd have to set the network.trr.mode to 3 to test if it's really working. Mode 2 uses regular DNS as a backup if DOH fails, so you won't really know if you're using DOH if you don't test it in mode 3 first. – John Aug 19 '19 at 16:53
  • For some reason using network.trr.mode to 3 fails to work when I'm on mobile data, but works fine when I'm on WiFi. – m-p-3 Oct 14 '19 at 1:21

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