To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for Provider for Google Calendar by Achilleas
Rated 5 out of 5 stars
Makes my life extremely easier having all my Google calendars on Thunderbird. You could switch to CalDAV but I am waiting for Google tasks support, which I am aware is coming soon [1]. I'm giving this addon 5 stars up front for the dedication from the developer in maintaining this addon.
[1] - https://bugzil.la/493389
To create your own collections, you must have a Mozilla Add-ons account.