Good

It saves users' time efficiently

Poor optimization and doesn't even remove the top bar so it's making things worse.

This extension has been one of my all-time favourite. Shout out to the author for making Firefox a better production utility.

valo

The best way I've found to manage Tabs in FF. Coupled with a little userChrome.css magic to hide the old tab bar, and the experience is magical. TY Piro, for making this extension. :-D