That's my experience every time Firefox updates these days through unattended-upgrades. The sad thing is that it handled it just fine without crashing up until a few years ago.
A quick scroll trough the settings page shows me you can turn the automatic updates off if you want.
Also not something i've experienced. Have you checked whether the crash isn't caused by some weird addon or the like?
The problem is caused when Firefox is installed through your operating system's package manager. But after a bit of searching, it looks like you can just get a version of Firefox from Mozilla's website that contains its own updater and avoids this problem.
