User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.2.1) Gecko/20021130 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.2.1) Gecko/20021130 The up/down sidebar scrollers near the bottom of the sidebar window either: A) Incorrectly respond to middle and right mouse clicks. ...or... B) Are painted incorrectly when the middle and right mouse buttons are clicked on them. Under Windows, I (and Microsoft ;-) prefer option (A). In other words, neither scroller button (up or down) should respond with a tab scroll when clicked upon by the middle or right mouse buttons. If such functionality were permitted with Windows GUI standards, then option (B) would apply. In other words, the scroller buttons do not depress (read: get painted properly) when they are clicked with either the middle or right mouse buttons -- yet they still perform their scrolling functions. Reproducible: Always Steps to Reproduce: 1. Press [F9] to toggle the Sidebar window ON. 2. With more than a half dozen tabs active, you should see the sidebar scroller buttons visible near the bottom of the sidebar window. If so, then continue. Otherwise, enable or add more sidebar panels until the scroller buttons are visible. 3. Right-click on either or both scroller buttons (up and/or down). NOTE: You should have witnessed a scrolling action. This is incorrect under Windows. Likewise, the buttons were never "depressed" to visually indicate that they were being pressed. 4. Next, if you have middle mouse button (or a mouse scroll wheel that supports clicking), click it. NOTE: Again, you should have witnessed a scrolling action. Like above, this is incorrect. Actual Results: Scrolling occurred, and it shouldn't have. Also, the buttons were never painted in a "depressed" state to visually indicate that they were being pressed. Expected Results: If no pop-up, context-sensitive menu was assigned to these scrollers, then Mozilla should have ignored both the middle and right mouse clicks. Otherwise, it should have displayed the pop-up menu. I am using the Gray Modern theme, with both mouse gestures and autoscrolling projects installed.

*** This bug has been marked as a duplicate of 180078 ***

verified.