I'm also extremely disappointing with the lack of SQLite interface with the new Web Extensions.

While it's possible to re-implement Tab Groups with the new API, extensions like SQLite manager [1] will never work again.

I wrote instructions [2] on how to restore lost tab groups after update (involves downgrading and disabling updates).

[1] https://addons.mozilla.org/en-US/firefox/addon/sqlite-manage... [2] https://github.com/Quicksaver/Tab-Groups/issues/560#issuecom...