Iceggiren i Tab Grouper
Tab Grouper sɣur TheNamlessGuy
Icegger-it Armadium
Yettwasezmel 4 ɣef 5
sɣur Armadium, pred enim letomThis is where it's at, if you need tab groups for Firefox. The other extensions are too odd and obtuse for me, and this replicates Chrome-like grouping.