Rated 5 out of 5 stars

per adnexius el nov. 1, 2018 ·

Great but Thunderbird is now disabling this plugin as its legacy :((((

This review is for a previous version of the add-on (1.0.4). 

per Jonathan Cutting (desenvolupador) a mar. 29, 2019 ·

I've uploaded a version that is compatible with version 63 and up. It should be available shortly to install into the current Thunderbird beta if you want to give it a try.