Works only for less number of tabs. If the numbers increases, it fails and all you work gets damaged. Using for around 1 year now, it crashed multiple times, but I continued using it, since I did not find anything as useful as it was. But now, I don't think it deserves my time. Productive people should avoid using it as one cannot have any idea when it is going to crash, mix few tabs from two different groups, delete few tabs, delete few groups, ruin all your work, add same tabs in a single group for multiple times and the list goes on.

Nothing simple about this extension, it sounds like feature other browsers has, but really it takes just as long to navigate through shitty design that this extension has as if to sort through that 100 tabs you expected to organize.

non-working for my FF, lost of time

If you are an avid collector of tabs DO NOT INSTALL THIS EXTENSION!

As soon as I created my first tab group it instantly an irreversibly deleted all my 100+ tabs -- no option to recover them. This extension was a serious disruption to my workflow and it will take a long time to recover from this incident.

Um add-on que se comporta de forma muito estranha. Parece bem bugado. Usabilidade deixou a desejar muito.

Best one around. Fast leaning curve and super efficient, tabs are clearly organized. A global view allow to move tabs from one view to another, or to perform a global search.

@Exa Smith: Hidden tabs that does not belong to any screen can be recovered under "show other tabs" at the bottom of the menu. Then you are offered with several options like moving all these tab under current screen, or create a new screen for them.

As some others have reported:
When I group some tabs, the tabs I have not grouped gets hidden. Why?
Why hide tabs on my screen.
I have to click some unload button to somehow maybe bring them back.

Overall feels buggy, or weird. Discard button does nothing. Bug?

the best extension i ever used

This is a great ad on for organized people.

I signed up just to leave this review, lol: This add-on is absolutely wonderful and I can't even begin to imagine using Firefox without it. Being able to organize tabs into different groups is a game changer. And being able to easily switch between them makes research (for Linux, gaming, writing, entertainment) is simply wonderful. It's also easy to use, to move tabs around and to save and backup groups. It even saves ungrouped tabs for later. I love this!

Intuitive.

Was hoping for something similar to Chrome's tab groups. App was clunky, difficult to navigate, and slow to use.

Для роботи просупер

It had an error and I lost all the groups I had created. Waste of time, not reliable at all.

This extension is really amazing! It makes my browsing session more organized, navigable, and customizable, all from my side. No need to expose my information in exchange for any services.