Firefox didn’t like the Leviathan III page
Try clearing your cache and reloading. Works fine for me.
Its messed up for me, too 
ok, all’s I see is a leviathon II page. even if I put a “III” in place of the “II” it comes up w/the leviathion II page.
http://shop.yoyoexpert.com/product/180/Leviathan-II
What’s the URL you are going for?