This is absolutely horrendous in Firefox 7. About 60% of the bottom of the screen is completely black, leaving only about 300px high of contents, in any of the views.
It is the page I was linked to. But responsive.is displays a random website, and this website in particular didn't work. I guess if I had realized it was just a random website perhaps my reaction would have been different.
This isn't IE6, it's FF7, which is 5 months old! Screenie: https://picasaweb.google.com/lh/photo/wmSzaq9yag_BXWSeUCPeel...