How do I enable DNS over HTTPS on Firefox for Android? 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 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:


Dale answer
Mozilla Wiki Page
u/SKITTLE_LA Reddit answer