I’m pretty sure the weird stalling on Firefox (that is, when I’m actually trying to use the Numbat computer) is from snaps downloading themselves in the background without any notification.
I did this:
snap refresh --hold-forever
“Auto-refresh of all snaps held indefinitely”
TG
For whatever reason, I don’t think snaps auto-download on the Fossa miniPC, but after a couple months I put this on the Fossa too, just in case.