This add-on is as useless as "Download YouTube Videos, Easy,Fast And Simple" by Momo (is COCO=Momo???) Anyway, third party downloading should REALLY be stated on the description.

An addon for downloading videos on Youtube should never have to request permission to access data from ALL websites

Doesn't work!

Doesnt work at all

This add-on does not even show an option to download HD video, much less combine video and audio streams.

YouTube had a UI overhaul in Sep 2017, and on top of Electrolysis Firefox coming Nov 2017, it's a really hectic time to find any working add-ons these days.

It's very simple to use, just follow those 3 screenshots.

It works on both Sep 2017 UI and "old YouTube" UI.

The only reason i did not give 5-star is the links seem to be generated / provided by a third-party website, and not by this add-on author. So, it keeps me worried from time to time which one will go out of service / update / etc.