Good

I use Firefox because this add-on exists. It is such a valuable add-on.
Report a small bug. If you duplicate a tab by middle-clicking the reload button in Firefox, a new tab group will be created automatically the next time Firefox starts.

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Incredibly useful if you have too many tabs and windows open. I have now reduced it down to one window, and my work item tabs bundled together into their own project groups.

Possibly the best extension out there!

Feels more like "Simple Tab Workspaces" to be honest, but turns out that's just what I needed. It's a powerful and polished extension; there are fully-fledged browsers trying to implement workspaces and still lagging behind STG. That said, it might not have the most intuitive learning curve for some.

This extension is the reason I cannot leave firefox and move to chromium based browser

Incredibly useful!!

As an IT technician, I'm often switching between multiple tabs.
This add-on allows me to group tabs according to my customers, and simplify my day-to-day navigation.
A very useful feature of this addon is the ability to associate a group with a tab container: cookies are compartmentalized, so I can easily use several admin accounts on the same admin portal at the same time (several admin 365 accounts...).

Very powerful, easy to use, convenient. Great design!