After the update save dialogs and some other things in Firefox, when used via Firejail, would just crash the browser. I understand there are issues in Gimp, Thunderbird, and other programs. There’s an issue with gdk-pixbuf2
https://bbs.archlinux.org/viewtopic.php?id=309553
I tried some workarounds on the Github issue but ultimately I couldn’t get it to work right so I downgraded both gdk-pixbuf2 and lib32-gdk-pixbuf2 from 2.44.4-1 to 2.42.12-2. I know downgrading is not the perfect solution but for now I’ll accept it