Review for Provider for Google Calendar by ACa
Rated 4 out of 5 stars
Very useful app.
One nuisance for me is that the when copying from one calendar to a google calendar it automatically sends out an email to all the guest list. eg. If I am invited to event A. And I copy Event A to Google Calendar. I send out invites to everyone on the guest list.
To create your own collections, you must have a Mozilla Add-ons account.