Rated 1 out of 5 stars

This one during the time when Google left things alone was great. I have installed the latest version into the Thunderbird Portable. Now it just hangs and causes the TB to pop up a unresponsive script error many times. I still have it installed, just not enabled until I can come across a fix for this. I am using only 4 calendars, all Gmail.

This review is for a previous version of the add-on (3.3).