It's not a "snotty 'tude." IE simply renders CSS and other bits of code incorrectly (incorrectly defined as being outside the W3C specifications.) That's just how it is.
Firefox is more than tabbed browsing, but I get the feeling you aren't in the listening mood.
IE is just forgiving when it comes to rendering. The article suggests that Firefox just plain ignores the CSS div tag altogether and just fills the screen to the edges unless with some brute force coding you can get Firefox to behave.
Yes, it's a snotty 'tude.
The mouseover features on this page --
http://hcsb.broadmanholman.com/crossmain.asp
-- work on IE/Avant, not on Firefox. Let them know of the bug, they informed me that it wasn't a bug, it was improper coding. So they wouldn't fix it.
I. Don't. Care.
I just want to be able to use the page. Avant lets me, Ff doesn't.
So show me whether YOU're in a listening mood.
Dan