Your only other option, of course, is to update Flash, and if you go that route, you should plan on updating on a regular basis, it’s been a problem for more than a year. I play on a backgammon site that uses Flash to display the boards, and it has been a constant problem, to the point that I’m considering ditching the site once all my games end. The biggest problem is when you update and FireFox decides they need to babysit you and still won’t let you run it, which has happened multiple times.