Did the upgrade succeed after killing that dialog?
Can you try reinstalling the firefox package and share the output here?
sudo apt reinstall firefox
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1975642
Title:
package firefox 100.0.2+build1-0ubuntu0.21.10.1 failed to
install/upgrade: new firefox package pre-installation script
subprocess was killed by signal (Killed)
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