Secunia reported a pair of frame injection vulnerabilities that could result in popup blocking. http://secunia.com/secunia_research/2004-13/advisory/ https://bugzilla.mozilla.org/show_bug.cgi?id=273699
Since this bug is going to be closely related to the firefox issue, please see bug 142506 for additional information.
The secunia demo no longer works. I've created a demo located here http://people.redhat.com/bressers/spoof_test/
Lifting embargo
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-335.html