If you want to turn off DoH right now, see https://codeberg.org/librewolf/issues/issues/2029#issuecomment-2281388
More info: https://codeberg.org/librewolf/issues/issues/1975#issuecomment-2281407
Seems like it's similar to https://reddit.adminforge.de/r/LibreWolf/comments/1f4ush4/
More info: https://codeberg.org/librewolf/issues/issues/1975#issuecomment-2281407