Rated 4 out of 5 stars

Like others, I found that Provider stopped working in v78.4. Removing/reinstalling did nothing for me, nor did trying hide/unhide (especially as my Google calendars then disappeared and I couldn't add them back - just stuck on asking me to select calendars but not showing anything to select).

However, in case it helps anyone else, the Open Google Calendar extension https://addons.thunderbird.net/en-us/thunderbird/addon/open-google-calendar/ still works, and has been a lifesaver!

I mainly used Provider so I could easily copy/paste and amend entries in Google calendars anyway, and now Google has provided a Duplicate function (which also works in Open Google Calendar) not having Provider isn't such a great loss. I'd still like to be able to use Ctrl c and Ctrl v for Google calendar entries though!

This review is for a previous version of the add-on (78.0.1).