The top position of the scroll thumb indicator in a vertical scrollbar is a pixel too low. In Firefox, look at the vertical scrollbar when scrolled all the way to the top. Note that the gray shadow at the top of the tracking area is more prominent than it is in other applications when the scrollbar is all the way at the top. Related to bug 134642? Same cause as bug 300058? (I found this while trying to track down the turds that appear when the control draw event handler is installed.)
Created attachment 192698 [details] Comparison, Grab @ 200% Scrollbars in Camino (left) and Firefox lined up side by side. Note that the Camino scroller is all the way at its top position, and the Firefox scrollbar is a pixel lower, although both documents were scrolled all the way to the top. (Although Firefox is in the background, its scrollbar appears active due to bug 262389/bug 177945.)
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