Rated 5 out of 5 stars

For those who reverted back to 0.32 version :
update to the latest version 1.02
delete your current google agenda
create a new google agenda
check ics
put in the adress box your private url for ics (you need to connect to your google account / agenda parameters to get this url)
go through the entire process
within seconds you'll have you agenda working on thunderbird.

This review is for a previous version of the add-on (1.0.2).  This user has other reviews of this add-on.