Board Thread:Support Requests - Designing Your Wikia/@comment-4189499-20140711140017/@comment-5454372-20140712130642

I'm using 30.0 as well, so I'm not too sure what's going on there.

From what I can tell, it looks like something's happening with the subnav-2-item class (the individual bits which say "Wiki Activity", "Random Page" etc). Removing the next line up (i.e. "subnav-2", the entire bottom bar) causes the black line between the top and bottom navbars to disappear, so I'm not sure that's where the problem is.

Edit: I'm comparing between Chrome and Firefox now, and I'm noticing a subtle change in the size of the text. Check the exact way your paragraphs display on your Test 2 page, it should be most obvious there. That subtle difference may be what's causing Firefox's version to break if the text in the bar is being squished off the page (though it still doesn't explain why I can see it properly on my own browser).