I can not express how useful this add-on has been to me. It is phenomenal to be able to group tabs according to what I'm working on and to swap between groups as needed. It's great for pausing a project and returning to it later.

So very, very good. I keep wanting to recommend it to friends who have 100 tabs open, but most are running chrome and it doesn't seem to have a similar add-on. Their loss!

I just came back to rate this extension again, having forgotten that I already gave it 5 stars. The reason is that I have been very frustrated with constantly losing my tab groupings after FF updates or the occasional computer reboot. Fortunately i learned that Simple Tab groups keeps backups and was able to restore my groups. My blood pressure is back to normal and I would give it a 6th star.

Thank you Drive 4ik