Review for Provider for Google Calendar by VIctor Sudakov
Rated 4 out of 5 stars
Using v115.0.2. It works sufficiently well with calendar events but is broken in syncing Google Tasks. Tasks created or marked completed in Google Tasks sometimes do not appear or fail to change status in Thunderbird etc. Tasks created in Thunderbird usually appear in Google Tasks though. There is a "diode" somewhere along the way.
This review is for a previous version of the add-on (115.0.2).To create your own collections, you must have a Mozilla Add-ons account.