After minimizing Thunderbird (version 17 and previous) by clicking "To tray" button (which I placed in it toolbar), tooltip stays on screen, which displayed button description. This tooltip can be removed by moving mouse over it, so it's not critical, but rather annoying.
(Screenshot. I have my Windows 7 taskbar on the right side of screen)
After minimizing Thunderbird (version 17 and previous) by clicking "To tray" button (which I placed in it toolbar), tooltip stays on screen, which displayed button description. This tooltip can be removed by moving mouse over it, so it's not critical, but rather annoying.
(Screenshot. I have my Windows 7 taskbar on the right side of screen)