Mozilla is close to releasing of its near-final version of Firefox 3.5, but the updated browser wasn't quite ready in time for a planned day of widespread testing. Earlier this month, Mozilla set Friday to be Firefox 3.5 RC1 Test Day. But RC1, the first release candidate designed to be more stable than the earlier Firefox beta versions, wasn't finished for the occasion. ____________ Source: C|Net
More improvements of JS speed, and a lot of crash fixes, plus render fixes. Also they are working on a smaller update of the look on some of the icons.
I hope they integrate well into Windows 7, I am liking the look Chrome has going for it, especially in Win7.