This is what I needed from many years ago and finally I found it!

The most necessary extension for Firefox. It works very well until version 86.0.1, but it is "breaking" in version 87, consuming all the memory and crashing the browser. Even so, I prefer to use the old version of the browser and keep the add-on installed, but correct that, please, I would be very happy. Congratulations to the developers!

Brilliant add-on. This is as close as I've come to Opera's workspaces (which I loved). This is even better though, as it combines grouped tabs with Firefox's containers. Also, if you're concerned that switching between groups is not just closing the current group's tabs and re-loading the selected group's tabs, then don't worry. They just show/hide tabs as you select different groups which is exactly what I wanted!

Please port this over to chrome..... I desperately need this on my brave-browser :/

This extension is just plain awesome! :-) Together with the "Tab Center Reborn" extension managing a huge amount of tabs is just pleasure. At first it takes a little bit to get used to it but after a while it's really fun. Many thanks for that great extension!

I can't live without this add-on now! It has revolutionized my browsing experience!!

the best tab extension for firefox.

good!

Great extension, probably the only one I found that had enough options to organize all my 500+ tabs and finally close them, while being able to archive them into a backup file, which I can still restore later on.
The behavior of "hiding tabs" when you add them into a group is a bit counter-intuitive at first, but you get used to it, and besides it's not really what I'm using the extension for, and I guess this saves memory.

An overall very polished add-on. Excellent work, and thank you !