This add-on can:
Access your data for all websites

PRO UPGRADE : Since Youtube no longer provides direct download links for 1080p and MP3 qualities these two qualities require server infrastructure for processing, therefore user needs to Pay and Upgrade here >>>, you have the choice to pay whatever you want for this one-time upgrade which helps me keep this service alive for all users.


Why does it want your user data from all websites?
It requires pay upgrade. although it says it can be any amount you want it forces you to pay $30 to upgrade it.

If you just want to download mp3 there was another one in the addon page that requests your info from ONLY youtube.com, is completely free, two easy clicks to download the vid as mp3 and works well. Won't name it but it's on the same list.