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.
aviv.raffon.net/2008/01/02/YetAnotherDialogSpoofingFirefoxBasicAuthentication.aspx
aviv.raffon.net/2008/01/05/FirefoxDialogSpoofingFAQ.aspx
blog.mozilla.com/security/2008/01/04/basicauth-dialog-realm-value-spoofing/
www.securityfocus.com/archive/1/485732/100/200/threaded
www.securityfocus.com/archive/1/485738/100/200/threaded
www.securityfocus.com/bid/27111
bugzilla.mozilla.org/show_bug.cgi?id=244273