No that is definetly a bug, as it spits out strange error messages.
I dont think Firefox running through Podman in rootless mode can create user namespaces? But not sure, will check that.
I have auto updates enabled and I reboot daily. This is not an issue especially on ublue where they are on by default.
Oh okay, didnt know Bazzite builds slower than the other images.
Instead of blocking users, education is the way better option. Flatpak Firefox does not have user namespace sandbox support, which is a pretty big deal.