Review for Provider for Google Calendar by Chris
Rated 1 out of 5 stars
So Google in its infinite stupidity has decided that unsecure apps will no longer be allowed access on May 30 2022 and will cut off all access.
So pretty much most apps will cease to work.
So before installing addons check with Google to see if it works, that is pretty much impossible though as Google does not maintain any support for its own services.
To create your own collections, you must have a Mozilla Add-ons account.