Great, another example of a site that is vendor locked to the Chrome browser.
Considering your site doesn't work on the majority of browsers (Neither Firefox nor IE), I'm not sure what "testing" you've actually done.
Strange. I was working with Firefox 21, and it didn't work. I've updated to 22 and it did.
Works fine on my 21
Works fine on iceweasel 21 (Debian ff rebrand).
Working fine for me in Firefox 17 (ESR)
Fails when Ad Block Plus is running. Don't have time to figure out which bit Ad Block is blocking though I'm afraid.
Its working with AdBlock plus 1.4.1
It's gonna depend on what filters you're subscribed to I imagine. The anti-social list that blocks facebook spying etc. seems to break pages most out of the lists I sub to.
It also works fine in Safari, although that's likely because of the -webkit- CSS prefixes.