This addon takes a while to getting used to, but I believe it will increase productivity and browser performance over time.

Works perfectly; frees up space on my browser and helps me regain focus. Fantastic!

The only bad thing about this game changing plugin is that I did not install it years ago!

Perfect! Does exactly what it's designed to do without a lot of redundant functions that other addons already perform. I use this in tandem with Session Buddy and Tab Wrangler to keep a reign on FF memory usage. This is an excellent feature in addition to them. It's function, quite simply, is to close all tabs (not pinned if you choose), and create a simple list of them all to be easily retrieved. YES, it opens it's own tab for this purpose. So what? One is better than a hundred. Saw that ridiculous complaint in one review. Don't listen to all the one star reviews. Almost all of them have no clue how addons work or their intended purpose. This does precisely what it's supposed to. Period.