It's the best replacement for the legacy add-on "Tab Groups"!! I only wish is was a bit more refined like Tab Groups.

Enfin un successeur de groupes d'onglets compatible avec la nouvelle version de firefox !!!
le fonctionnement est quasi similaire et avec une interface graphique +1

Seems to be exactly what i wish for, english or german version would be really great ^^

I can't understand the setting - but play around - very nice!!