Firefox shopping cart widget formatting problem

Hi,

I've just found out that while the shopping cart widget works perfectly well with Chrome, it gets really messed up if I use Firefox (see screenshots below).

Chrome - http://174.122.174.219/~yoga/wp-content/uploads/2013/01/ishot-172.png

Firefox - http://174.122.174.219/~yoga/wp-content/uploads/2013/01/ishot-174.png

Any ideas?

Thanks in advance,

Robert Ford