I recently had a problem where snapd kept sigfaulting and the fix was to purge it completely. It turns out that everything I had in snap was available in flatpak, which I prefer anyway.

there is also appimage sometimes if you ever need something that isn't flatpak or system packages. It launches fast just like flatpak and unlike snap.

Don't forget `sudo apt-mark hold snapd` to prevent reinstalling it as a side dependency.

I believe lxd is still only available as snap packages on Ubuntu. I am not using it anymore but it's actually quite nice. Fortunately it's now been forked as incus and both Debian and openSUSE will have it. Probably a red-haty distro too.

You didn’t have to wait for this new Firefox package to stop using snaps, did you?

The Firefox deb in the repos redirected and did a snap install or some weirdness at least at some point.

Flatpaks are a perfectly functional option https://flathub.org/apps/org.mozilla.firefox

Must have been an Ubuntu problem.

I install Firefox via Debian's package, and have never had 'snapd' installed.

Yes. Ubuntu maintained their own deb package that redirected to a snap install.