Rated 5 out of 5 stars

by citizenserious on Dec. 19, 2018 · permalink

I use(ed) "DesktopOK" to minimize Thunderbird.
Info: http://www.softwareok.de/?page=Windows/Info/DesktopOK/3
Download: http://www.softwareok.com/?seite=Freeware/DesktopOK
Because this addon hasn't worked at the beginning (but it now does)
https://addons.thunderbird.net/en-US/thunderbird/addon/minimizetotray-reanimated/