Puntuado con 4 de 5 estrellas

The add-on works for me (Thunderbird 115.9.0 on Kubuntu 23.10), very useful in preventing me from sending unfinished emails.

Two minor issues: the pop up (modal or separate window) does not have the continue or cancel options highlighted, so I need to hit tab first to use the keyboard to continue or cancel.

Secondly, if the window or modal is dismissed in any way besides hitting continue or cancel, you cannot edit the contents of the email (you need to reopen the dialog and hit cancel, then you can again).