Are you having problems with Facebook games on Facebook using IE9 or Firefox 4?
Here is what I found. These guys (Microsoft and Mozilla) got something right in their browsers; giving the browsers direct access to the graphics card.
So this is really good most of the time, pages will act more responsive.
Adobe has to get with it, Flash games aren’t displaying properly with the new browsers.
The solution in IE9 is to go into Internet Options (click on the gear icon on the right side of the window) > Advanced Tab. Then check the tab the Graphics Acceleration option to use software rendering.
In Firefox 4, go into Options > Advanced > General tab. Then uncheck the “Use hardware acceleration when available” box.
These solutions will allow the games to work a little better, but general web pages might not be as responsive.
I have an additional information on this topic here.