Rated 3 out of 5 stars

by Hann990011 on Oct. 4, 2018 ·

This might be helpful. I have created this file for Thunderbird 52.9.1. I followed the instructions above and it works.
Download and install as a file on ad dons
https://drive.google.com/open?id=1T4CwPKMvE-vtPqoi_KP7ImFvNtMybjJc

This review is for a previous version of the add-on (20110323.1-typefix).