I gave it 5 stars a couple of months ago, but I have to downgrade to 1 star because if you open new tabs this extension doesn't recognize them and if you switch groups it loses the new tabs. Other extensions such as "Panorama View" and "All Tabs Helper" show all the tabs in the group including recently opened ones. If I close FF and reopen it shows all of my tabs including the new ones, but this extension still doesn't show any of recently open tabs. Other than that it works great.