The Search feature in Mozilla Firefox before 42.0 on Android through 4.4 supports search-engine URL registration through an intent and can access this URL in a privileged context in conjunction with the crash reporter, which allows attackers to read log files and visit file: URLs of HTML documents via a crafted application.
https://bugzilla.mozilla.org/show_bug.cgi?id=1208520
http://www.securitytracker.com/id/1034069
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.mozilla.org/security/announce/2015/mfsa2015-124.html
http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00015.html