Here is a download link for linux thunderbird : https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/128.8.0esr/linux-x86_64/de/thunderbird-128.8.0esr.tar.bz2Don't forget to uninstall first the package of a given thunderbird
Downgraded thunderbird 136 to 128.8 and had to configure lots of details again. In the past i could just copy hidden folder .thunderbird from a backup but thunderbird forces me now to configure a new account and afterwards i could import from /home/...
Bad news I am on Linux and try "kdocker", but that is not as usefull as "minimize on close".So have to get used to klick only ( !! ) the minimize button . Perhaps downgrade thunderbird and put it on "hold" : I have to think about that ... because i ...