GitHub - nmaier/mintrayr: Mozilla extension: Minimize windows into the system tray (Firefox, Thunderbird, Seamonkey, Instantbird)
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Windows Taskbar Unread Badge displays a dynamic icon to indicate the total number of unread mails in Thunderbird - gHacks Tech News
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Birdtray Ubuntu PPA Updated With Unread Email Count And Xwayland Fixes (Thunderbird Tray Icon) - Linux Uprising Blog
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