I had the same problem with Firefox and downloaded it for the exact same reason, my site was not being displayed properly using the firefox browser
Wait till you try and figure out how to fix your site so it is displayed properly in the Firefox, that will be a pain in the ass
After trying to figure it out and having tech guys working on it, i gave it up, it is either an issue with your site builder or error codes in your html
You might have to go into your site builder and fix your site using the firefox browser, or you can go to netmechanic.com and find out where your errors in the html are and remove them, it may not work, but that’s your most likely starting point
If you do figure out how to fix your site, please share the info with me
Actually, i just saw your problem, with the navigation menu…you’re lucky, that’s easy to fix, you should see how ridiculous my site looks in the firefox browser, take a look at these 2 pages…
http://www.superiorgaming.net/poker.html
http://www.superiorgaming.net/sportsbook.html
and compare them using the 2 browsers
With your problem i would just adjust the size of the pics/banners to the right of the page, make them smaller in width and it should work, do it using the firefox browser in your site builder
good luck