One of the attachments suggests you have a locally modified version of
the apparmor profile for firefox, and it looks quite different from the
version shipped by the package. Are you sure you disabled apparmor? You
should unload the firefox profile, rather than completely disabling
apparmor for the system:
sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1874656
Title:
on ubuntu 20.04, firefox does not start well
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