Rated 3 out of 5 stars

by KarelW on Oct. 15, 2014 ·

The post from PeterR on October 15, 2014 pointed me to the solution to use CalDAV.

Got it working again. Thanks PeterR.
https://support.google.com/calendar/answer/99358?hl=nl
Unfortunately this page is in Dutch, changing hl=nl to hl=en does not provide the same info. The English page has much less information than the Dutch page.
So here is a translated page.
https://translate.google.nl/translate?sl=nl&tl=en&js=y&prev=_t&hl=nl&ie=UTF-8&u=https%3A%2F%2Fsupport.google.com%2Fcalendar%2Fanswer%2F99358%3Fhl%3Dnl&edit-text=

Scroll down to "Enable Google Calendar Mozilla Sunbird" and follow instructions.

This review is for a previous version of the add-on (1.0.1).