User-Agent: Mozilla/5.0 (Windows NT 5.0; rv:2.0b10) Gecko/20100101 Firefox/4.0b10 Build Identifier: Mozilla/5.0 (Windows NT 5.0; rv:2.0b10) Gecko/20100101 Firefox/4.0b10 This bug is per Neil's comment 48 in bug 489303: "(In reply to comment #43) > > 2. Shouldn't the resizer be hidden when the addons bar is shown if it's going > > to have it's own resizer? > > I will fix this one. It only occurs when both scrollbars are visible (Image 5) >I have only partially fixed this one. There scrollcorner background doesn't appear when only one scrollbar is visible. I think I'd rather fix this in a followup bug or patch." This is easily testable against about:mozilla page. - When no scrollbars are shown, resizer has transparent background. - When both scrollbars are shown, resizer uses -moz-Dialog background color. - When one scrollbar is shown, resizer uses white (field?) background color. Reproducible: Always

Confirmed on build: Mozilla/5.0 (Windows NT 5.1; rv:2.0b11pre) Gecko/20110202 Firefox/4.0b11pre