Hm, when using MinimizeToTray+, is there a way to always have the ThunderBird icon in the tray (whether minimized or not), and change the icon when an account has new mail? Currently I get the always-there-no-matter-what icon (from MTT+), but can't find any options to merge the new-mail-available (from vanilla TB3) with it... heck, doesn't even seem like you can turn that notification icon off?