[bigbugbag]

I didn't know of this one, is its tab management any good ? As in how do you move tabs around groups, open/duplicat/close tabs and groups ?

The 'simplified' in its name makes me doubtful it has any of the advanced features I need.

[Manishearth]

No idea, I haven't used tab groups in a year, so I've never tried the new version.

These "redone" addons that work post 57 start out pretty bare-minimum but they rapidly gain features.