від Realraven (Axel Grude) (Розробник) Лис. 18, 2017 · постійне посилання

...but you can download a version that doesn't stop the latest Thunderbird versions from starting here:
https://www.mozdev.org/bugs/show_bug.cgi?id=26446
however there are still a few issues with this, pleasee subscribe to the bug to be notified of final fixes.