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 Google Calendar Tab by Alistair George
Rated 5 out of 5 stars
Excellent; the ONLY Google Calendar addon that works with TB 68+
Google Provider and others stopped working.
Notice it puts a small button on bar which you need to press to get the calendar.
To create your own collections, you must have a Mozilla Add-ons account.