Firefox printing does not work in 22.04

[Josef Wolf]

I have configured four printers in the setings.

Printing from firefox won't show those printers, it offers only "Store as PDF".

Then I choose "print from system dialog". In this dialog also the configured
printers are not shown and I get only options "store in file" and
"print using LPR". Choosing "print using LPR" does nothing, although I have a
default printer configured.

I guess reaon for the problem is that firefox runs in a snap sandbox?

-- 
Josef Wolf
jw at raven.inka.de