Review for Provider for Google Calendar by Adrian Challinor
Rated 2 out of 5 stars
This partially works. I can install it, I see a list of my Google calendars, and the events display in the calendar and on the today screen. So far so good.
What doesn't work is trying to add invites received on my work email address which is different from my Google mail address. It says the calendar is not writable.
To create your own collections, you must have a Mozilla Add-ons account.