It's great if you just use one window, but the multi-window behavior is so undesirable that I had to stop using this. The window behavior is nothing like the tab behavior. Here's how it should work. A group should be able to span multiple windows (it can't). When you select a group, it should close any windows that do not contain any tabs within that group. That way, the only tabs you have open across all windows are the tabs in that tab group. This would give behavior that is consistent with tabs. But now there's this half baked solution where you can have a different tab group open in every window and it's even harder to figure out what's going on. The whole point of having multiple windows is so I can look at multiple windows at the same time. Otherwise I would just use tab groups instead of windows! With the current solution, you can't have two windows side by side that make sense with each other. It feels totally random which windows get which tab groups assigned to them. A group is supposed to represent the only things I want to have open at once, which should be able to include multiple side by side windows together in the same group that get opened and closed together when I switch groups.

cheap version of sidebery, dont know why people use this

Would be better if the groups were visible in the tab bar rather than being hidden away in a button. But at the same time, much nicer than Sidebery for not taking up half my screen with a sidebar just to use it.

Crashes in private mode of Firefox.

This is the exact opposite of simple. Check Sidebery for the simple (and also faster) one.

Works flawlessly! My only complaint would be that it's a little slow to startup on HDD-based systems, and prevents tabs from loading content until it's finished "warming up" (which can take up to 30 seconds)

Not simple. It's hard to understand what it's even doing, aside from _definitely_ not what I want or expect it to do. The worst extension I have _ever_ installed, and I've installed some pretty terrible extensions. It's less than worthless. At least if it were just worthless, it wouldn't be a big mess to clean up after I uninstall it.

Excellent! It's a must-have for daily usage!

very counter-intuitive to use : if i wanted to group my tabs i want them in the same browser not in a different browser window

The most important addon to keep me in Firefox!

Needed to hop onto Firefox while Chrome was being a bitch, and this add-on allowed me to replicate Chrome's groups... somewhat. How to switch between groups took a bit of getting used to, and it's more helpful in some areas (i.e. creating groups) and less in others (quickly switching between groups). That alone would be a 4-star rating, but what drops it down is the difficulty of organizing tab groups in the groups tab. I can only organize it alphabetically, so I have to go through some hoops if I want my groups in a particular order, which is fairly annoying. All in all, a helpful add-on, if not exactly what I was hoping for.