Developer reply by John Bieling
Rated 1 out of 5 stars
Breaks when thunderbird gets updated from 68 to 78. Entering calender entries no longer works (google, exchange, nextcloud calendars are all affected)
This review is for a previous version of the add-on (2.16).Thanks. I removed that version.
To create your own collections, you must have a Mozilla Add-ons account.