I have Firefox v 3.5.7 latest one. I cudn't got any descrepancies. plz upgrade ur browser. And QT testing team, i think u have to test this site on atleast some bunch of browsers which i m mentioning below as this is the site for Quality people by the Quality people so it Should be correct in all manners.
Bunch should be for compatabilty testing:
Firefox 3.5 (no need to test on previous version as it is auto upgradation enabled)
Google Chrome 3.0