Mozilla Firefox before Firefox 2.0.0.13, and SeaMonkey before 1.1.9, can automatically install TLS client certificates with minimal user interaction, and automatically sends these certificates when requested, which makes it easier for remote web sites to track user activities across domains by requesting the TLS client certificates from other domains.
https://bugzilla.mozilla.org/show_bug.cgi?id=395399
http://www.vupen.com/english/advisories/2008/1793/references
http://www.vupen.com/english/advisories/2008/0998/references
http://www.us-cert.gov/cas/techalerts/TA08-087A.html
http://www.ubuntu.com/usn/usn-592-1
http://www.securitytracker.com/id?1019704
http://www.securityfocus.com/bid/28448
http://www.securityfocus.com/archive/1/490196/100/0/threaded
http://www.mozilla.org/security/announce/2008/mfsa2008-17.html
http://www.mandriva.com/security/advisories?name=MDVSA-2008:080
http://www.gentoo.org/security/en/glsa/glsa-200805-18.xml
http://www.debian.org/security/2008/dsa-1535
http://www.debian.org/security/2008/dsa-1534
http://www.debian.org/security/2008/dsa-1532
http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0128
http://sunsolve.sun.com/search/document.do?assetkey=1-26-238492-1
http://secunia.com/advisories/30620
http://secunia.com/advisories/30327
http://secunia.com/advisories/29645
http://secunia.com/advisories/29616
http://secunia.com/advisories/29560
http://secunia.com/advisories/29558
http://secunia.com/advisories/29547
http://secunia.com/advisories/29541
http://secunia.com/advisories/29539
http://secunia.com/advisories/29526
http://lists.opensuse.org/opensuse-security-announce/2008-04/msg00002.html