The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: firefox 114.0+build3-0ubuntu0.20.04.1 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-6143-1
CVE-2023-34414, CVE-2023-34415, CVE-2023-34416, CVE-2023-34417
https://launchpad.net/ubuntu/+source/firefox/114.0+build3-0ubuntu0.20.04.1
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