Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Thanks, but this has not solved the problem. I still get a blank screen when I try to play a golf games.

I found the solution as follows :

Used the following link to install flashplayer:

http://download.macromedia.com/pub/flashplayer/latest/help/install_flash_player.exe

That was very good work. Well done. Please flag your last post as Solved Problem so others will know.