The front pages (and only the front pages) of both gaming and meta.gaming give me a rendering issue in FF 3.6(.11) with full page zoom set to 150%. In my test, any full page zoom > 100% shows this problem.
I found out it's a problem with the
#tabs selector and the margins. When I change
margin: 2px 5px to
margin: 1px 5px it works as expected. I also realized that only the front pages show the tabs active, features, ... are move into the page from the border, on the other pages, see example, they're not.