fullscreen flash videos with firefox

[andre hollstein]

Hello all
I'm using Ion3 on my ubuntu box integrated in gnome where I followed the
instructions given here:  http://wiki.ubuntuusers.de/Ion3
One problem i couldn't solve myself is still out there. I can not play flash
videos in firefox in fullscreen - when i press the fs button the video goes
fullscreen for one moment and then returns to the original state. What can I
do? Can this misbehaviour be solved with winprob options?
Thanx for any help on this.
Cheers Andre