I am a korean.
when i use Google toolbar translate function in Firefox 3.x with translate words by hovering over them checked and hover over a text "1 cup", it says "1 cup= 236.6 cubic centimeter.."
but in Firefox 4.x , It just says "cup= 컵"
So i prefer Firefox 3.x which also offer unit converting. but Firefox 4.x doesn't offer unit converting... it only tranlate it to korean..