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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?

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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 104.16.249.249)

  • 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.

credits/references:

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  • I needed this because my mobile data DNS is failing for some addresses. After setting network.trr.mode=3 and network.trr.bootstrapAddress=104.16.249.249 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  • This seems either outdated or wrong.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
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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 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google) or 9.9.9.9 (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 1.1.1.1 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 9.9.9.9) or Private DNS provider hostname with 1dot1dot1dot1.cloudflare-dns.com, for instance (credit to this page on TechRepublic).

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    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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