Not sure what happened, but you should try re-installing as suggested by
dpkg:
sudo apt reinstall firefox
Please let us know how it goes.
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1903445
Title:
package firefox 82.0.2+build1-0ubuntu0.20.04.1 failed to
install/upgrade: package is in a very bad inconsistent state; you
should reinstall it before attempting configuration
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