Firefox actually breaks my site? WTF

[twodayslate]

I have no idea where to put this. Sorry if in wrong forum.
Site (http://pbguntrader.com) (does not validate b/c in middle of mod, easy fix though)
Firefox, on my computer and only my computer, breaks my website. It also double posts. This is only on my computer. Have tried it on multiple computers. If I use a different browser on my computer the site works.
Cache is cleared and disabled. The visual break appears after JS is loaded. Not a JS expert so that might be the problem?

Any thoughts?

[_Aerospace_Eng_]

I think it might be the determineStyle() function causing the issue.

[twodayslate]

I think it might be the determineStyle() function causing the issue.

I commented out the style switcher. Still messed up.

And why is this effecting only my computer? My only guess is my addons?

Thanks for the reply!

[_Aerospace_Eng_]

Its not only affecting your computer. The layout messes up on my system as well. It only messes up after enabling javascript. Start removing javascript until the problem goes away. At least then you'll know what the culprit is and then maybe we'll have a better chance of figuring a way to fix it.

[twodayslate]

Will do, thanks! :)

Edit:// Yep, it was javascript. I just need to learn the basics of that :p
THANKS!

edit:// Actually it is a weird float bug. IDK