Oh right, no, the mouseover only works on the charts and just shows you the points total after each GP.
It's very disappointing that Google seem to be deliberately making their code not work in FF and IE, for very obvious reasons.
It just means more work as I will need to find some new code which produces tables and charts, then integrate it all into the site again, as well as update all the templates and code
If you get the chance, install Google Chrome and you'll see it in action.