Rated 3 out of 5 stars

per otzmotzfitzifotz el feb. 16, 2019 · enllaç permanent

Sadly this is not like minimize to tray because it DOES NOT MINIMIZE TO THE TRAY! It just keeps tb in the taskbar, like the name suggests. That means thunderbird still gets in your way when switching between applications / alt-tabbing / multitasking.
I really hope there will be a solution for this soon.

It does exactly what it says but isn't really usefull imo.
Not a real min-to-tray.