Review for Provider for Google Calendar by ipsecog
Rated 4 out of 5 stars
1.0.2 works very well and seems a lot more slick than the earlier versions. However I have one issue, wondering if others have seen it: if you go offline, e.g. by powering up your computer without an active network connection, all calendars are disabled, and the only way to get them back is to restart Thunderbird (with an active connection).
Else 5 stars because this is the only way which really makes TB play with Google such that I can maintain a single calendar across all devices and accounts!
To create your own collections, you must have a Mozilla Add-ons account.