I generally don't have my FF4 (RC1) window maximized so I see the glass trim around the FF window. However, I've noticed that Microsoft tweaks that glass trim by having a lighter shade on towards the top of the sides and a darker shade on the lower part of the sides. That doesn't appear to change on anything that has the glass trim....except as of right now on FF4, it does. The darker shade will move up or move down. I can't tell what triggers it but, the same behavior in other browers does NOT re-produce the problem.

I hope this is clear to understand, lol. Any input would be appreciated.