Description of problem: http://www.devincible.com/films/ad1.rm If you try to open this URL in firefox-0.10.1-1.0PR1.19, the "Opening" dialog has the "OK" button greyed out no matter what you do. I have RealPlayer-10.0.1-3 from RHEL4 LACD installed, not sure if this is related to the problem.
firefox-1.0-2.fc3 still affected.
WFM > rpm -q firefox RealPlayer firefox-1.0-2 RealPlayer-10.0.1-3