The only and best way to have tree style tabs! So useful! Thanks!
Lucadeparis

A colossal improvement over the standard tab bar.

Frankly, it's long past time we collectively killed the standard tab bar for good. The standard tab bar disgusts me.

I wish someone would make this for Android Firefox.

E: 5 yrs later, this is still say half of the reason I use firefox instead of chrome

please import this extension for chrome or opera or vivaldi, i cant handle firefox anymore

This is my favorite extension since 2003.