Rated 4 out of 5 stars

Essential accessory! It’s so basic that it should be built into Thunderbird at the factory. Extremely useful to synchronize appointments.
Buggy in Version 78.3.2 (64 bit): Does not work, but if I disable and then re-enable that calendar (e.g. work), it will show and sync again. If there is no error, it is 5 stars.

This review is for a previous version of the add-on (78.0.1).  This user has a previous review of this add-on.