jQuery and CSS Animations Choppy in Firefox

Question

I'm working on a minisite that features a lot of jQuery animation. It works fine in Safari, Chrome & IE9, but the animation is really choppy in Firefox (7, 8 & 9) on OSX. I thought CSS animation would be smoother, so I adapted the iPad version of the site and tried that out in Firefox. It seems just as bad.

I haven't spent a lot of time with Firefox, so I'm not sure what I'm doing wrong here. Do I need to trigger GPU acceleration (like using translateZ(0) in Webkit,) or is it just used all the time for everything (like IE9?) Is Firefox just not powerful enough, even with the GPU?

I'd really appreciate any help I can get. I'm kind of at the end of my rope on this.