Flash plugin not working under your Fedora + Firefox 3 combination?
Though it is correctly installed, after some updates it stops to work.
Try:
sudo rpm -e libflashsupport
and restart Firefox
Sometimes it says libflashsupport is not installed. Then:
download the latest FlashPlayer 10 for 64bit Linux as a tarball from http://labs.adobe.com/downloads/flashplayer10.html
extract it and copy the resulting libflashplayer into either /usr/lib64/mozilla/plugins/ or ~/.mozilla/plugins/.
Some other issues are described on the Fedora wikipage on Flash.
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