Rated 5 out of 5 stars

per jmozmoz el nov. 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.

This review is for a previous version of the add-on (4.7.1). 

per Realraven (Axel Grude) (desenvolupador) a nov. 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.