Review for Provider for Google Calendar by lex
Rated 5 out of 5 stars
I use this add-on for many of my google calendars.
Google is changing things on their side of the network making t difficult for the end users. NightHawk (kudos to you!), has found a workaround using the oath passwords saved within TB. follow his instructions and it will work. I use 10 different calendars within google.
Here is the instructions by NightHawk:
Open TB. You will get a popup for each Google Account associated with the calendars you have. Pay close attention to the account name and authorise only the first pop-up, then CLOSE the rest, and close TB again. Repeat this process for each Google Account until all are authorized
To create your own collections, you must have a Mozilla Add-ons account.