mixpanel.com is analytics tool. I don't track your personal data, only action on site. For example install add-ons, add, open or rename collection and etc. I use this information to analyze and add a new feature and remove not use functions.
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 ...
