Yesterday, Software Updates noticed that there was an update to the kernel. (I have things set up so that it just alerts me about updated and doesn't actually do it.)
I let it install that but before doing the reboot, there are a couple of things I need to finish doing in Firefox... except that I can't. No tab will load any page, and no open tab will successfully refresh.
This used to be a sign that I'd updated the Firefox via its .deb, but not restarted Firefox - was there a silent Firefox snap update?
If I look at its Help / About, it's currently version "99.0.1, canonical-002 1.0".
If I look at ~/snap/firefox, I can only see
drwxr-xr-x 4 user user 4.0K Apr 21 16:46 1232
drwxr-xr-x 4 user user 4.0K Apr 21 16:46 common
lrwxrwxrwx 1 user user 4 Apr 21 16:46 current -> 1232
so I would be guessing not - they'd be more than one version there, if there had been, wouldn't there?
But this is why I am seriously considering abandoning Ubuntu for Linux Mint a second time*: I really do not want Firefox updating without me saying 'Yes, do it now'.
(* The first time was over Unity and GNOME 3. Then Ubuntu MATE happened and I came back.)