Very good addon. Exactly as described. Missing one star due to better interface such as warning you before closing more then 10 tabs.

Update Nov 02021: Used it for a further few years and works well. Unfortunately it hasn't been updated in that time but doesn't need to.

A great complement to About sessionstore,

https://addons.mozilla.org/addon/about-sessionstore/

Just one thing caught me by surprise: the need to click alongside (not on) disclosure triangles.

The stats page has no details at all. That's the only draw back.

I was figuring it might be interesting to see what kind of information this would provide. The moment I opened it, I realized how much I had underestimated it. This really does provide me with easy access to information that makes managing my high-tab-load life easier. Thank you!
EDIT: ... and I was still underestimating how helpful this extensions is! It is solving a lot of problems for me - especially ones caused by the change in FF architecture. Thanks again!

Just what I've wanted for a long time.

Would love to see the total number of tabs displayed as a badge on the toolbar button, or at least when hovering over the button, display useful information such as the total tab count and number of loaded tabs (instead of simply reading "Tab Stats").

Provides what is in my opinion critical missing functionality. Makes it much easier to get tab hoarding under control.