Rated 5 out of 5 stars

Makes my life extremely easier having all my Google calendars on Thunderbird. You could switch to CalDAV but I am waiting for Google tasks support, which I am aware is coming soon [1]. I'm giving this addon 5 stars up front for the dedication from the developer in maintaining this addon.

[1] - https://bugzil.la/493389

This review is for a previous version of the add-on (0.13).