Rated 5 out of 5 stars

Thunderbird changed some cookie settings and broke this plugin. It's less on the developer (who did a great job writing it) and more on the user to fix their settings like he suggested a few times. The other review is spot on, and my new version works after I add the cookie exception.

Anyone having problems with authentication (oauth) check your cookie settings and exceptions. Worked great for me (thanks again).

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

Rated 4 out of 5 stars

Ubuntu 14.04, password OAuth prompt is now broken via google popup. Displays a cookie page error. Reverting to previous version.

@Philipp Thanks! That cookies setting was reset when I updated Thunderbird. Calendar works now properly with the old version. I'll keep an eye out for what's up with the new one. Updated to 4 stars for now.

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

Please check the Thunderbird preferences and make sure you enable cookies, at least for the time of the login.