Seems good, but after installing, the Firefox began frequently to freeze and crash. After that the "workspaces" lost their tabs or exchange it, or have errors (for example shows more tabs number then exist).
Sorry very much, because I need this great feature, which I found in Vivaldi.

hate it (sorry ....sounded like a good idea)
- i'm certain that i must have clicked 'something' that caused me to go from 46 open tabs to 92tabs, and then 184tabs - each one reloading each time
- and yes (as seems to be the case with all of the workspace managers) each tab reloads every time you change work spaces -even if only for a brief moment -even if you change workspaces to quickly check on (1) tab, the ENTIRE workspace reloads
- and when it reloads the tabs, the well organized, and collapsible 'tree style tab' view ... gone! all of branches gone; all of the tabs move to one long list
- never did find where you easily accessed the full list of workspaces without going into the extensions manager...

This add-on will try to reload all your freaking tabs when you switch between workspaces
I would say this is so dumb

This is no good when you have got 100500 tabs and using 2 windows

Installed fine and I was able to create tab groups, but when I tried to switch between them it would open the tabs from that group without closing the ones from the previously active group. Ended up with four copies of each tab after trying to go back and forth a few times.

I'm running FireFox 124.0.1 (64-bit) on Windows 11.