Thanks for the help. This installation, where I have tried to debug the
problem, is installed in a virtual machine. Other installations are on
bare metal. I did the Firefox 128.0 update manually. 128.0.2 seemed to
be available for five days before Firefox updated directly to 128.0.3
This is the longest time Firefox in this virtual machine has waited for
an automatic update. Otherwise, I have normally updated manually.

I have had the virtual machine running various times a day, and have
observed that the snaps update check has taken place before shutting
down the virtual machine. Sometimes Firefox has been running and
sometimes I haven't started it at all after starting the machine.

I got to check out one of these other installations. At some point, Firefox was 
updated to the latest version. However, other, including security updates, were 
still not installed. Among other things, the kernel was still in version 
6.8.0-35.
The use of this computer has been normally 3-5 times a week, 1-2 hours a day.

I haven't been able to check this third installation, where I also
encountered this old version of Firefox about a week after the release
of the newer version. This computer is used even less often than the
previous one. But it had been used a couple of times during that week,
probably for about half an hour at a time.

I paid attention to the Firefox update problem when I wanted to see how
the update notifications look like in this latest version of Ubuntu. I
noticed that security updates happen in the background, often without
notification to the user during machine shutdown. I haven't seen the
Firefox update notification when Firefox has been running. I have also
never seen a notification about other system updates, even though a week
has been selected as the notification interval and new package updates
have already been available for a couple of weeks. But these other
update problems do not fall under Firefox's bug in any way.

Should this bug be closed, and then if necessary make a new one under
the snapd package?

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https://bugs.launchpad.net/bugs/2074295

Title:
  Firefox won't auto update on Ubuntu 24.04

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