Yettwasezmel 5 ɣef 5 n yetran

sɛur troglobyte di June 11, 2020 · aseɣwen yezgan

It worked fine in Thunderbird 68.9.0
I didn't need to change anything. The extension added two new options in the menu to add your signature at cursor position or at the end of email.
Simple, but great and a really needed addition