Mozilla Firefox before 48.0 does not properly restrict drag-and-drop (aka dataTransfer) actions for file: URIs, which allows user-assisted remote attackers to access local files via a crafted web site.
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1226977
https://security.gentoo.org/glsa/201701-15
http://www.mozilla.org/security/announce/2016/mfsa2016-81.html