Works fine and cool [Win10] [TB v38.5.1] Rated 5 out of 5 stars

Yes it works.. but you have to activate it from options because after installation default options does not change the default behavior of TB.
Add-ons manager (or Tools add-ons) -- > Extensions -- > select options of this extensions and change the behavior you want.
I chose "Instead of closing and minimizing"

yep, not working anymore Rated 1 out of 5 stars

either F9 or the menu button aren't working anymore tb 38.5.1 (don't know since when though)

Not working anymore with TB 38.x Rated 1 out of 5 stars

F9 not working anymore with ThunderBird 38.x.

This user has a previous review of this add-on.

Clever! Rated 4 out of 5 stars

I keep a minimized FF on tray at all times, immenediately after windows log in. It makes loading a (second) session/window whnen I need it so much faster! Faster than chrome that is! ;)

Wonderful Rated 5 out of 5 stars

Really makes the tray more useful!

doesn't work properly Rated 1 out of 5 stars

only one star because with thunderbird 38.3.0 and windows7 64bit doesn't work properly. It minimize to tray but it is not possible to write a new message or check mail and other functions.
new release pleaseeeee

great! Rated 5 out of 5 stars

とてもいいです!
40.0.3

Only works on minimize, not on close Rated 4 out of 5 stars

Tried on Fx 42 beta, Linux, XCFE 4.12 (Debian).
Closing Firefox doesn't minimize, but closes the program.

Thanks

Doesn't work on Linux Mint Cinnamon / GNOME3 Rated 1 out of 5 stars

Works perfectly on GNOME2 but when minimizing doesn't works on GNOME3 desktops like Cinnamon, only work when I close. Maybe is problem by Thunderbird's 38.2.0 version. Please fix it, is a very useful extension.

Absolutely not working on Thunderbird 38.2.0 and Firefox 40.0.3 on Linux Mint 17.2 Cinnamon Rated 1 out of 5 stars

Absolutely not working on Thunderbird 38.2.0 and Firefox 40.0.3 on Linux Mint 17.2 Cinnamon :(

So bad that these Mozilla apps dont include this feature as default, same as Microsoft Outlook, as we all wanna receive our emails all day but who wanna waste a large space for a window on its tray...?

Rated 1 out of 5 stars

Does not work for Thunderbird 38.2.0 under Mint, so probably same problem in Ubuntu 14.04

Rated 5 out of 5 stars

В последних версиях Thunderbird перестало сворачивать с кнопки "В трей" (2015.08.30)

WHY F9 MINIMIZE TO TRAY NOT WORKING ON NEW VERSION?!?! Rated 1 out of 5 stars

NOT WORKING IN NEW VERSION

Still the best. Rated 5 out of 5 stars

Simple but effective without bothering me with stuff I don't need or want, sometimes no updates for years are a good thing (as long as it stays compatible).

Gefällt mir sehr Rated 5 out of 5 stars

Hallo,
tolle Erweiterung für Thunderbird. Ich nutze es in TB Version 38.1.0. auf Windows 10. Läuft bei mir fast ohne Probleme. Nur das Minimieren über den Addon-Button funktioniert nicht. Aber damit kann ich leben. Cool wäre, wenn man den Button ohne Text oben unter dem Minimieren-Schaltfläche (vom Fenster) einfügen könnte.
Ansonsten eine tolle Arbeit, die der Entwickler hier gemacht hat.

Problems in Thunderbird 38.1 Rated 4 out of 5 stars

It's not working properly in TB 38.1.
Please update the addon.

Does'nt work in TB38.1.0... Rated 3 out of 5 stars

... but in FF 39.0 works fine

missing the 'write new mail' command in right-click menu Rated 4 out of 5 stars

adds an important feature to tb. I'm using it since many years, it works now in 31.8.0 esr. But in the past there was a 'write new mail' command in the right-click menu that I'm really missing now. An other issue: when you have a second tb window accidentally you cannot close it permanently without deactivating this addon.

Actually it does partially work on TB 38.1 Rated 3 out of 5 stars

At least the WINNT-64 and the Linux-64 versions do mostly work, only the F9 command is not working, neither from the menu nor from the keyboard.

not work in 38.0.1 Rated 5 out of 5 stars

not work in 38.0.1