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).  This user has a previous review of this add-on.