It's best if you read the rest of the information that I posted along with this, here: http://leaverou.me/2010/10/my-ft2010-slides-and-csss-my-pres...

I mention quite a lot known compatibility issues with the presentation, including the Firefox 3.6/Win problem (it works fine in my FF3.6 for OSX) along with an explanation of why it only works in latest versions. :)