Guess I'll have to use an outdated version of Firefox forever. Tab Groups is absolutely indispensable add-on, and Mozilla was idiotic to remove this feature in

Guess I'll have to use an outdated version of Firefox forever. Tab Groups is absolutely indispensable add-on, and Mozilla was idiotic to remove this feature in the first place. And now they're making it impossible for add-on authors to keep working on their add-ons.