Created attachment 417872 [details] Screenshot of UI glitch When moving the mouse to hover over an email address in a message header, there is a narrow strip in which the cursor changes from a pointer to a hand, and then (after moving further) back to a pointer. This strip is about one or two pixels wide all around the address and star. (The cursor also turns into a hand when hovering over the star -- that's different, and expected.) Attaching screenshot (note that cursor was re-added, with approximate appearance in in approximate position; can give more precise screenshot if needed). STR: 1. Select a message in the message pane to preview it, or open message in a new tab or window 2. Move mouse cursor slowly over the edge of the address highlight block until it changes shape Expected: Mouse cursor should not change on hover. Actual: Mouse cursor changes within a narrow zone, then changes back outside that, producing a flickering effect. Additional notes: I'm using the default Thunderbird theme, but the Windows theme is Classic, which likely has something to do with this bug. Behavior consistently seen in Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:220.127.116.11) Gecko/20091204 Lightning/1.0pre Thunderbird/3.0 ID:20091204171430; reproducible also in Safe Mode.
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