The Mozilla Maintenance Service updater in Mozilla Firefox before 46.0 on Windows allows user-assisted remote attackers to delete arbitrary files by leveraging certain local file execution.
https://security.gentoo.org/glsa/201701-15
https://bugzilla.mozilla.org/show_bug.cgi?id=1212939
http://www.securitytracker.com/id/1035692
http://www.mozilla.org/security/announce/2016/mfsa2016-40.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00038.html