Very useful. I love the option to pin the pages. Also, it's great to be able to save the groups to Bookmarks. And it's possible to update them if you have made any important change in the group.
Simply, fantastic one.

Very useful and more customizable than others side tabs extensions.

It is the Best sidebar I've ever used. The freedom to customize nearly every aspect is superb, and the default configuration is already super lovely and usable.

5.0.0 works flawlessly. ∞/5 all day long.

5.1.1 requires you to turn animations on. neat. 5/5.

Takes some tinkering and getting used to, but helped my quitting my addiction to Arc Browser. Should inform users that you must take snapshots if you want to keep your tabs