Rated 3 out of 5 stars

This add-on worked perfectly until few days ago, when Thunderbird updated to version 68.9.0 released on June 03, 2020.
Now, I have to reinstall the add-on each time I restart Thunderbird, otherwise my calendar is freezed (my events appear but they are like shadows) and I have no reminder.
Reinstalling the add-on and restarting Thunderbird fixes the issue until the next shutdown.
So I have ti do this after each startup.

This review is for a previous version of the add-on (68.2.1).