I really like this addon and the hard work of the author.

Some bugs:

1. The extension sometime reports some previously closed tabs as unmanaged
2. Performance. Noticeable lag when switching groups with many tabs / opening the popup

This is helpfull and simple!

So far the best replacement for the old tabgroup plugin by far. I recently just downloaded this and trying out, but I'm really impressed. Love the memory saving settings when you got tons of tabs in different groups. Will come back if I find some bugs, problems or suggestions!

EDIT: So a couple of things I noticed:
When trying to open a group as a new window does not work, sometimes it just opens a new blank page. It would also be nice if there was an option to take an already open window with tabs and create a group from that, rather than just one tab at the time. I don't know if it's documentet somewhere if there is a way.
When clicking or hover over the Tool tips (?) does not seem to do anything.

Correct me if I'm wrong!

Believe me, This is the best tab groups manager so far.

Amazing add on, simple to use without any troubles.

best add on for tab groups replacement so far

Thank you so much! A great replacement for the old Tab Groups I agree. This means I could finally update FF on all my computers. You, good sir, are a godsend. Great work!

Almost perfect replacement for the old Tab Groups that was destroyed by Mozilla. Only lacking sidebar support, so if you use that, be aware.

Be sure to turn on automatic backup!! Today, when Firefox crashed, the group record disappeared!!

first impression:
nicely done :-)

This looks great, just started using it and it seems like a good replacement for the old Tap Groups

Really great addon! Thanks for keeping Firefox going!

Development now advanced far enough for this add-on to be a reliable replacement for the old tab groups extension, but latest version drops ability to denote current group through color of toolbar icon--an inconvenience.

Finally a really good alternative to my old tab groups. It's optically pleasing and I didn't discover major flaws yet.
One minor error though: When using the Amazon fav icon as a group icon (right click on tab > set icon for group) it does show up on the usual STG icon but not when I click that icon to show the group overview. There it will show a not-found-icon. So far I could only reproduce this with Amazon (GER).

It's the first time I even bother to write a review. This is the best tab management tool and I tried tens of them. It's even better (simpler and faster) than the original one it's mentioning as inspiration.

I've been using it for a few days now and didn't see any bugs.

5 stars for the superb effort in getting this add-on up to par with the old Tab Groups (and surpassing it in some ways)! Must have been a huge challenge with FFQ, I can imagine. I use tab groups every day for work to help keep everything organized. Don't know what I'd do without it. Keep up the great work!

The best!

This is a very useful extension. I wouldn't say it's simple, but it is powerful.

It's useful to be able to move tabs into groups based on their URLs; I use this to separate different projects so that I can switch context between them.

It doesn't seem to play well with other extensions that automatically close tabs in the background, though; for example Dustman. After a tab is auto-closed, when I switch to that group, STG says “Invalid tab” and “Background not inited”. After that, STG doesn't work. If I disable and re-enable it, the toolbar button never finishes loading. Restarting Firefox seems to fix it. (I think this may be the same issue as #212 on GitHub.)

Edit 2018-07-20: Thanks, I've updated to 3.0.10. Let's see how it goes!

Edit 2018-07-23: I'm still seeing “Invalid tab” notifications that stop STG from loading the group, but I haven't yet seen a “Background not inited” one, and STG starts working properly again when I reload it from the menu.