Rated 5 out of 5 stars

le jmozmoz ar Samh. 14, 2017 ·

This is really a very useful addon. Unfortunately, it does not work anymore with Thunderbird 57.0b1. I had to start Thunderbird in safe-mode and deactivate it.

Léirmheas ar leagan níos sine den bhreiseán seo (4.7.1). 

le Realraven (Axel Grude) (Forbróir) ar Samh. 15, 2017 ·

Please check here:
https://www.mozdev.org/bugs/show_bug.cgi?id=26439

It's complicated but there are some explanations and a working test version available there.