Rated 4 out of 5 stars

A very useful add-on. Used it with TB 2, I'm downloading it for TB3.

Does this version support offline access to your GCalendar?

If the download link doesn't work for you ("Add-on not found"), try the Sunbird page:
https://addons.mozilla.org/en-US/sunbird/addon/4631

This review is for a previous version of the add-on (0.6b1).