I'm looking for two features: On minimizing window, thunderbird should minimize normally to taskbar as programs usually do. (This happens if the 'move it to tray' feature is disabled) On closing the window, thunderbird should minimize as icon to the notification area tray. (This happens if the 'move it to tray' feature is enabled) I think this should be an option integrated in thunderbird settings, if not to be the default behavior i haven't found any extension to solve this yet and it is a little bit annoying when I use many windows and press alt-tab when thunderbird is minimized to the tray with x or - button when using the addon not to close thunderbird when pressing x, so it won't appear alongside other windows and i have to reclick the tray icon to show it again I want to have both abilities to minimize to tray and minimize to TB at the same time I believe that mail client has to be always running even if I press x button, unless I press Quit from inside the app I have clarified the behavior expected above Thanks