Electo, is nView turned off? WB doesn't play well with that part of nVidia's software....
I updated my drivers recently, and I went to check if there were more recent versions but there aren't. Oddly, with the new version (169.21), they got rid of nView, so I got confused when I went to look for the configuration settings.

Nuage is an Essorant skin, Tooltips have nothing to do with WB other than the color of them.
I understand. I guess the point that I was trying to make earlier about the start menu translucency was that WB doesn't use true per-pixel alpha on the start menu, and that perhaps Stardock should consider switching to per-pixel for the start menu.
Maybe I should clarify what I was saying up there. If you play a video and drag it so the video itself is underneath where the start menu would be, and you then click on the start menu, a single frame of the video will be stuck where the menu is "translucent." WB clearly just takes a single snapshot of what's behind the menu and sticks it there, instead of doing true per-pixel alpha.
So you know that Firefox is fine elsewhere... here's a shot on a non-modded Aero Metal system
I don't understand. What are you saying?