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In the past I used this plugin: https://addons.mozilla.org/en-US/thunderbird/addon/firetray/ a quote from the official plugin page: display unread messages count in tray icon Worked perfectly as far as I can remember.


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Thanks to @whtyger. There were necessary steps I was unaware of. 1) Add text/x-session session line to /etc/mime.types 2) Copy icon file to theme folder: sudo cp my_icon.png /usr/share/icons/Mint-X/mimetypes/48/text-x-session.png sudo ln -s text-x-session.png /usr/share/icons/Mint-X/mimetypes/48/gnome-mime-text-x-session.png sudo gtk-update-icon-cache ...



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