Interesting. Relevant debug output from DpkgTerminalLog.txt:

==> Installing the firefox snap
error: cannot perform the following tasks:
- Mount snap "firefox" (1943) (snap "firefox" assumes unsupported features: 
snapd2.54 (try to update snapd and refresh the core snap))


This problem is most probably caused when dist-upgrading to Ubuntu 22.04, if 
the update for firefox is installed before the update for snapd, because the 
firefox snap requires snapd 2.54.

This can be fixed in the firefox deb by specifying a version for the
snapd Pre-Depends.

** Changed in: firefox (Ubuntu)
     Assignee: (unassigned) => Olivier Tilloy (osomon)

** Changed in: firefox (Ubuntu)
   Importance: Undecided => Medium

** Changed in: firefox (Ubuntu)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1992678

Title:
  package firefox 1:1snap1-0ubuntu2 failed to install/upgrade: new
  firefox package pre-installation script subprocess returned error exit
  status 1

Status in firefox package in Ubuntu:
  In Progress

Bug description:
  Terminal showed me how to install the missing dependencies and I was
  able to follow that and get Firefox working by myself.  I'd have
  thought sorting missing dependencies ought to have been built in to
  the upgrade program instead of coming up with a worrying report that
  the upgrade had failed

  ProblemType: Package
  DistroRelease: Ubuntu 22.04
  ProcVersionSignature: Ubuntu 5.15.0-50.56-generic 5.15.60
  Uname: Linux 5.15.0-50-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Tue Oct 11 21:03:22 2022
  ErrorMessage: new firefox package pre-installation script subprocess returned 
error exit status 1
  Python3Details: /usr/bin/python3.10, Python 3.10.6, python3-minimal, 
3.10.6-1~22.04
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.21.1ubuntu2.1
   apt  2.4.8
  Snap: firefox 105.0.3-1 (stable)
  Snap.Changes:
   ID   Status  Spawn                      Ready                      Summary
   6    Done    2022-10-12T11:31:22+07:00  2022-10-12T11:33:55+07:00  Install 
"firefox" snap
  Title: package firefox 1:1snap1-0ubuntu2 failed to install/upgrade: new 
firefox package pre-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to jammy on 2022-10-11 (1 days ago)

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