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!

Very useful for organizing my tab hoarding habit

[3 September 2024 Update]: Great Addon but since I installed it, it conflicts with the 'Tab Session manager', and causes errors to my Firefox. Please fix that problem].

WOW! Thanks to this video on YouTube (How to Use Tab Groups in Firefox) BY "The Linux Cast
"channel. That has demonstrated this extension, and I am glad I found that video. Because this Add-on is Truly helpful and convenient to me. Because I have 3500 tabs open in my browser and it makes my life much easier now that I have them in groups! Thank you for creating such an awesome extension!! 🌟🌟🌟🌟🌟👍