Mozilla Firefox 1.5 before 1.5.0.2 and SeaMonkey before 1.0.1 causes certain windows to become translucent due to an interaction between XUL content windows and the history mechanism, which might allow user-assisted remote attackers to trick users into executing arbitrary code.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1471
https://exchange.xforce.ibmcloud.com/vulnerabilities/25827
http://www.vupen.com/english/advisories/2008/0083
http://www.vupen.com/english/advisories/2006/3748
http://www.vupen.com/english/advisories/2006/1356
http://www.securityfocus.com/bid/17516
http://www.securityfocus.com/archive/1/446658/100/200/threaded
http://www.mozilla.org/security/announce/2006/mfsa2006-29.html
http://secunia.com/advisories/22066