Rated 4 out of 5 stars

Great extension, but now only authenticates with Google correctly if you have cookies enabled.

Thunderbird/Google/Addon changed something, so now you need to change Options / Privacy / "Accept Cookies from sites" to ticked.

("Keep cookies until I close Thunderbird" will work).

Essential addon if you need to work with Google calendars.

This review is for a previous version of the add-on (3.1).