Rated 5 out of 5 stars

by David on June 16, 2015 ·

This add-on is a Godsend. Integrates with the Lightning add-on for Thunderbird and provides Google calendar access.
There were initial problems with freezing but it was the Birthdays Calendar add-on that was found to be the culprit. I have since unsubscribed from this Birthdays calendar and everything is working great. Thank you...

This review is for a previous version of the add-on (1.0.4). 

by Philipp Kewisch (Developer) on June 16, 2015 ·

Can you try unsubscribing for the Birthdays Calendar? This calendar is known to cause trouble for some reason.