Just installed WF and impressions are very good, seems to run much smoother that FF. The downloaded .exe is named 14.0.2 but help/about says 14.0.1 which is weird. The Facebook page, images and text at first seemed of lesser quality (on ATI 5670, Catalyst 12.6). Maybe something related to what scottjay mentioned - although I'm not 100% sure this quality loss actually exists - I did switch back to FF because of the KeyScrambler issue. If that is fixed, I'm back to WF.
Also, if FF is opened after using WF, the Acrobat plug-in asks for reinstallation every time.
update: Also, the excellent F.B. Purity extension seems to have problems between FF/WF sessions. Needs to be re-enabled every time.