Mozilla Firefox 43.x mishandles attempts to connect to the Application Reputation service, which makes it easier for remote attackers to trigger an unintended download by leveraging the absence of reputation data.
lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html
lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html
www.mozilla.org/security/announce/2016/mfsa2016-11.html
www.securityfocus.com/bid/81949
www.securitytracker.com/id/1034825
www.ubuntu.com/usn/USN-2880-1
www.ubuntu.com/usn/USN-2880-2
bugzilla.mozilla.org/show_bug.cgi?id=1237103
security.gentoo.org/glsa/201605-06