The WebChannel.jsm module in Mozilla Firefox before 38.0 allows remote attackers to bypass the Same Origin Policy and obtain sensitive webchannel-response data via a crafted web site containing an IFRAME element referencing a different web site that is intended to read this data.
http://lists.opensuse.org/opensuse-updates/2015-05/msg00036.html
http://www.mozilla.org/security/announce/2015/mfsa2015-56.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securityfocus.com/bid/74611
http://www.ubuntu.com/usn/USN-2602-1