OK, so I installed FF4 in w7, std installation-- the fonts in my usual sites all look funny and disconcerting (I just accepted font defaults, no tweaking). Pictures in my messages on a social site had a white border at top and bottom. Switched back to v 3.6, and everything is normal. I did look and notice that the photos still had a top and bottom border, but it was much less noticeable, so much so that I would not have seen it unless I had been looking for it.

So my conclusion is that FF4 does not have the graphics stuff down yet. Too bad.