I am currently working on my Facebook app and am having issues with it in firefox (Mac: Safari, Chrome, Opera and PC: Chrome, IE all work). I have it dynamically render out the flash countdowns (and the other content in that div). I have two buttons in the flash doc that send an external call to javascript that will either run a publish [fbook] api or fill in the div with the normal content. Unfortunately, any links or flash buttons that are dynamically rendered in the div don't work. The most you get out of it is a hover effect, not even a little link finger. Check it out at icountdown.net or apps.facebook.com/icountdown.