firefox is vulnerable to arbitrary code execution. It is possible because firefox does not properly perform a cast of an unspecified variable during handling of INPUT elements which allows attackers to inject arbitrary code via a crafted web site.
rhn.redhat.com/errata/RHSA-2016-1912.html
www.debian.org/security/2016/dsa-3674
www.mozilla.org/security/announce/2016/mfsa2016-85.html
www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
www.securityfocus.com/bid/93049
www.securitytracker.com/id/1036852
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1297934
rhn.redhat.com/errata/RHSA-2016-1912.html
security.gentoo.org/glsa/201701-15
www.mozilla.org/en-US/security/known-vulnerabilities/firefox-esr/#firefoxesr45.4
www.mozilla.org/security/advisories/mfsa2016-86/
www.mozilla.org/security/advisories/mfsa2016-88/