The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: firefox 108.0.1+build1-0ubuntu0.20.04.1 Ubuntu 18.04 LTS: firefox 108.0.1+build1-0ubuntu0.18.04.1 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-5782-2
https://ubuntu.com/security/notices/USN-5782-1
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2001921
https://launchpad.net/ubuntu/+source/firefox/108.0.1+build1-0ubuntu0.18.04.1
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