Mozilla Firefox 2.0.0.11, 3.0b2, and possibly earlier versions, when prompting for HTTP Basic Authentication, displays the site requesting the authentication after the Realm text, which might make it easier for remote HTTP servers to conduct phishing and spoofing attacks.
https://bugzilla.mozilla.org/show_bug.cgi?id=244273
http://www.securityfocus.com/bid/27111
http://www.securityfocus.com/archive/1/485738/100/200/threaded
http://www.securityfocus.com/archive/1/485732/100/200/threaded
http://blog.mozilla.com/security/2008/01/04/basicauth-dialog-realm-value-spoofing/
http://aviv.raffon.net/2008/01/05/FirefoxDialogSpoofingFAQ.aspx
http://aviv.raffon.net/2008/01/02/YetAnotherDialogSpoofingFirefoxBasicAuthentication.aspx