Rated 5 out of 5 stars
Works with TB 78.6.0 in both direction.
But I had to fiddle some hours in a TB version before (think, it was TB 78.4 or so), since then, it works.
As far as I remember, I had to cleanup TB cache
Then in a window in TB enter my Google credentials (and not click anything else while doing this, otherwise TB didn't remember my credentials correctly, maybe it forks to Firefox) and authorize the Provider as third party app (see https://support.google.com/accounts/answer/3466521?hl=en).