firefox is vulnerable to arbitrary code execution. The vulnerability exists through a memory corruption issue.
www.securityfocus.com/bid/104556
bugzilla.mozilla.org/buglist.cgi?bug_id=1461324%2C1414829%2C1395246%2C1467938%2C1461619%2C1425930%2C1438556%2C1454285%2C1459568%2C1463884
lists.debian.org/debian-lts-announce/2018/11/msg00011.html
security.gentoo.org/glsa/201810-01
security.gentoo.org/glsa/201811-13
usn.ubuntu.com/3705-1/
www.debian.org/security/2018/dsa-4295
www.mozilla.org/security/advisories/mfsa2018-15/
www.mozilla.org/security/advisories/mfsa2018-16/
www.mozilla.org/security/advisories/mfsa2018-19/