I think that's compiz related, I have the same problem with compiz desktop effects enabled, eg try selecting a game at
http://www.ferryhalim.com/orisinal/
but no problem if I disable effects (I'm in Fedora 12 now, ubuntu enables basic effects by default)
I may play with this later and let you know if I get a fix, someone probably knows the trick.
Bump: Ah, there you go
https://bugs.edge.launchpad.net/ubun...7/comments/153
translating the fix to Fedora 12 (i686)
Code:
su -
cd /usr/lib/nspluginwrapper/
mv npviewer.bin npviewer.bin.real
echo \#\!/bin/sh > npviewer.bin
echo GDK_NATIVE_WINDOWS=true /usr/lib/nspluginwrapper/npviewer.bin.real \$\* >> npviewer.bin
chmod 755 npviewer.bin
restart firefox
