birdtray: birdtray (tray icon mail notification for Thunderbird) birdtray: birdtray: Birdtray is a system tray new mail notification for Thunderbird 60+ birdtray: which does not require extensions. birdtray: birdtray: https://github.com/gyunaev/birdtray birdtray: birdtray: birdtray: birdtray: birdtray: