Firefox

[Ralf Mardorf]

Assuming 2017 issues are obsolte
( https://askubuntu.com/questions/886488/application-installed-as-snap-package-cant-see-printer ),

this issue from 2021 might be related:
https://askubuntu.com/questions/1260603/how-can-i-print-from-the-snap-packaged-version-of-firefox

Maybe the OP can provide some information. How does the OP try to print?
What happens when printing fails? Maybe there's a warning or error
message. Actually we can only guess. Maybe it doesn't print, because the
ink cartridge is empty ;). 

For snap allergy sufferers:

https://askubuntu.com/questions/1399383/how-to-install-firefox-as-a-traditional-deb-package-without-snap-in-ubuntu-22