firefox is vulnerable to arbitrary code execution. The vulnerability exists due to memory corruption which allows an attacker to execute arbitrary code on the system.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
access.redhat.com/errata/RHSA-2019:2694
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160
security.gentoo.org/glsa/201911-07
usn.ubuntu.com/4150-1/
www.mozilla.org/en-US/security/advisories/mfsa2019-27/
www.mozilla.org/security/advisories/mfsa2019-25/
www.mozilla.org/security/advisories/mfsa2019-26/
www.mozilla.org/security/advisories/mfsa2019-27/
www.mozilla.org/security/advisories/mfsa2019-29/
www.mozilla.org/security/advisories/mfsa2019-30/