Review for Provider for Google Calendar by H-Dave
Rated 2 out of 5 stars
This add-on works exactly as advertised. However I assumed that my calendar items would be available when I am offline. They are not.
This add-on does not make Lightning/Google the same as Outlook/Exchange. If you are offline your calendar is GONE. If you check the "cache" box then when you are offline your calendar is read-only....ugh.
Bottom line, this add-on only allows you to use the Lightning GUI to edit your Google Calendar -- when you are online.
To create your own collections, you must have a Mozilla Add-ons account.