Review for Provider for Google Calendar by joensson
Rated 5 out of 5 stars
I love this add-on. It is very simple to add calendars - basically just copy the XML address from the Google Calendar settings - and enter your username/password and youre up and running.
I now have all four of my google calendars in Thunderbird/Lightning and they all work like a charm.
I also have two shared calendars configured with Danish holidays and important soccer matches I absolutely must see :)
Now if someone could just make a "Provider for Exchange"... then I would no longer need to run Outlook or use the crappy outlook web access thingy.
To create your own collections, you must have a Mozilla Add-ons account.