@Myth,
It is because of your "matching Products" box down below - the first product in your link doesn't scroll in FF because it's matching product box is only 2-wide
The other 2 product links you gave scroll because their are enough matching products to have the box go 3 wide.
You'll need to look at the portion of the template product.tpl and adjust the <td> widths that are creating the columns for the Matching Products box
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