As of lately, my firefox's window seems to lose its transparency at random times. (i.e. The theme for ''only'' firefox changes from Aero to Basic). I am currently running on Windows 7 and am using FireFox 3.6.8. I don't know what might be causing this problem. I've tried disabling all add-ons but the problem persists. Once it happens, the only way to change it back is to restart firefox. Just yesterday, I downloaded FireFox 4 Beta 3 to see if the problem would be gone, but the problem persisted. This is especially bad because once it happened on FireFox 4, the minimize, window, and X buttons in the top right corner vanished, so it would be nice if I could figure out how to fix the problem before FireFox 4 was officially released.