Review for Provider for Google Calendar by MrTheV
Rated 4 out of 5 stars
Good but makes Thunderbird slow unresponsive and not responding very well.
I have 3 google calendars, including a shared one.
The script hangs, for instance, with the error Unresponsive Script in
chrome://calendar/content/calendar-multi-day-view.xml:3464
To create your own collections, you must have a Mozilla Add-ons account.