The session-restore feature in Mozilla Firefox before 28.0 and SeaMonkey before 2.25 does not consider the Content Security Policy of a data: URL, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted document that is accessed after a browser restart.
https://security.gentoo.org/glsa/201504-01
https://bugzilla.mozilla.org/show_bug.cgi?id=911547
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.mozilla.org/security/announce/2014/mfsa2014-23.html
http://lists.opensuse.org/opensuse-security-announce/2014-04/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00022.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00016.html