Review for Provider for Google Calendar by another_matt
Rated 2 out of 5 stars
Since version 1.X this add-on has been a mess for me. Simply connecting to Google was full of unexpected problems. It's not reliable. Entries have gone missing due to this mess.
I'm using version 0.32 for now and have disabled the auto-update.
To create your own collections, you must have a Mozilla Add-ons account.