firefox is vulnerable to arbitrary code execution. Multiple critical memory safety bugs allow a remote attacker to execute arbtirary code on the system.
access.redhat.com/errata/RHSA-2019:3193
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/buglist.cgi?bug_id=1558522%2C1577061%2C1548044%2C1571223%2C1573048%2C1578933%2C1575217%2C1583684%2C1586845%2C1581950%2C1583463%2C1586599
security.gentoo.org/glsa/202003-10
usn.ubuntu.com/4335-1/
www.mozilla.org/security/advisories/mfsa2019-33/
www.mozilla.org/security/advisories/mfsa2019-34/
www.mozilla.org/security/advisories/mfsa2019-35/