The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: firefox 62.0+build2-0ubuntu0.18.04.4 Ubuntu 16.04 LTS: firefox 62.0+build2-0ubuntu0.16.04.4 Ubuntu 14.04 LTS: firefox 62.0+build2-0ubuntu0.14.04.4 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-3761-2
https://ubuntu.com/security/notices/USN-3761-1
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1791789
https://launchpad.net/ubuntu/+source/firefox/62.0+build2-0ubuntu0.18.04.4 https://launchpad.net/ubuntu/+source/firefox/62.0+build2-0ubuntu0.16.04.4 https://launchpad.net/ubuntu/+source/firefox/62.0+build2-0ubuntu0.14.04.4
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