Very useful! Rated 4 out of 5 stars

It is a very good extention. No more need of lighting or Google calendar extention. Just work in your agenda directly in the cloud! I would give it a 5 star rating if it had working Google tasks.
<br>BTW: I changed the version nr. as mentioned here and it works as a charm in the latest Thunderbird!

This review is for a previous version of the add-on (3.8).