私にとって最早不可欠な拡張です。

Like it.
Gives me the freedom to use those extra couple of cm's at the top of the screen, by utilising the side of the screen a bit.
Been using it now several years.

I've been using Tree Style Tab for years. Occasionally it reloads (as in seems to close itself and reopen), but otherwise has performed flawlessly. It's a staple add-on for me, and is a big reason I use FireFox.

SUPER

This extension is the undeniable future of browsing the internet. 10/10 - Life changing.

[ FEATURE REQUEST ]:

Please let us make new empty tabs to use as tree parents. EXAMPLE: In unity editor, "create empty object" to use as parent of other objects. It is also important to have editable tab title that saves between sessions.

I expect that tabs are grouped automatically by root domain search on top in text box by words.