System diagnostic shows a package status corrupt warning.
Try to fix automatically and get further details about the corrupted package:
root@host:~# dpkg --configure -a root@host:~# dpkg --audit The following packages are in a mess due to serious problems during installation. They must be reinstalled for them (and any packages that depend on them) to function properly: firefox-esr Mozilla Firefox web browser - Extended Support Release (E
Remove the corrupted package and re-install it by
apt remove firefox-esr apt install firefox-esr
If still not fixed and the package is unneeded, simply remove it by
apt remove firefox-esr