The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: firefox 68.0.1+build1-0ubuntu0.19.04.1 Ubuntu 18.04 LTS: firefox 68.0.1+build1-0ubuntu0.18.04.1 Ubuntu 16.04 LTS: firefox 68.0.1+build1-0ubuntu0.16.04.1 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4054-2
https://ubuntu.com/security/notices/USN-4054-1
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1837941
https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.19.04.1 https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.18.04.1 https://launchpad.net/ubuntu/+source/firefox/68.0.1+build1-0ubuntu0.16.04.1
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