Rated 4 out of 5 stars

It would be 5 stars but recently, without apparent reason, it stopped working on Thunderbird 5. Even choosing to minimize from the menu File, it won't go to tray bar.
Also missing the "minimize at start" feature or the "always show tray icon" would be great.
Thanks

This review is for a previous version of the add-on (1.0.1-signed.1-signed).