Rated 5 out of 5 stars
One of the best productivity enhancing extensions out there, that will unfortunately no longer work after legacy extensions are disabled.
If you're like most others you have a zillion tabs open, but do want to get back to them. You mentally organize your tabs into workspaces, but don't want many, many windows cluttering your desktop. This extension is (was) the solution. It offers a great UI for organizing tabs into workspaces that you can recall at any time.
For me, and I'm sure for many others, this extension brings tabbed browsing into alignment with our mental model of how we use the web.