Try to remove and then install again:
apt remove firefox
apt install firefox
If it fails share the exact error you get.
** Also affects: snapd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2163476
Title:
snapd broken; then: package firefox (not installed) failed to
install/upgrade: new firefox package pre-installation script
subprocess returned error exit status 10
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