I can not figure out why this happens. I tried to play around with all the permissions, reset printer settings on Firefox, created new profiles, all had the same problem. But when I used those same profiles on the apt installation it printed just fine. Is there some weird Flatpak sandboxing happening because I can print fine from the Ungoogled Chromium Flatpak but not Firefox Flatpak.
Seems like a general Firefox issue then. Hope they fix it within the next update. I remember printing working fine so this confirms that an update broke it.
It’s pretty unfortunate, flatpak is the only thing that sandboxes
.mozilla/
out of the home directory because the folks at mozilla will not patch in XDG desktop specifications.Same thing with thunderbird as well.