Absolutely fantastic! I've been waiting for this to be ported over from Chrome for a while, and it's finally here!

A great add-on that will finally bring order within your 500 subscriptions through the power of folder structures. Works fine and is was I just what I was looking for. I still have no idea why youtube disgarded this important feature in the first place ...

it changed my whole youtube experience, perfect!!

Excellent and very timely addition. Thank you!