Firefox and IE breaks line with exact pixels

[kakiepiroi]

So, I have something like this:

4 objects with exactly 76x76px within a 320px holder.In Chrome, you can see above, it works just fine.But in Firefox and IE9 I get something like this:

with the same sized \[code\]<ul>\[/code\]

I only get it to display correctly if I resize the \[code\]<li>\[/code\]

Why is that? The image size is actually 76x76 and Chrome renders it correctly.Thanks in advance!