Review for ThunderCal by Gordol
Rated 4 out of 5 stars
This mostly works. When creating a new event on Google Calendar via ThunderCal, it always defaults to an all-day event even though I have Google Calendar itself (via the web browser) set to default to an hour duration. And the view via ThunderCal does not give me the ability to access my Google Calendar settings.
To create your own collections, you must have a Mozilla Add-ons account.