Yes

1.3.7 . Activating closed all my tabs yet increased RAM (not memory) use by 80MB. Opened as another window, which only made it more difficult to use because it was not possible to switch windows. The Tab Group window insisted on always being on top. Would work better as a tab. Kept on opening Google, even though i avoid Google. That is configurable. Color scheme is bright, independent of user browser configuration.

On installing this addon, it immediately closed my Firefox window, along with all my tabs, and opened a new window without any of my tabs. Luckily I knew I could bring back my old window with Ctrl-Shift-N, but this is very non-user-friendly. When I install an addon to organise my tabs, I don't expect the first thing it does to be to close them all without asking me, or telling me how to get them back.

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

Nice try, but still no replacement for the old 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

Sembra molto interessante, lo provo per qualche giorno.

È molto interessante la modalità d'uso ma non è ancora abbastanza stabile per le mie esigenze.
Decisamente da provare

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!!