This add-on uses deceptive and dishonest tactics to coerce users into buying license, as extensively described in many of these reviews: it deceptively converts all already free available high definition videos to a lower resolution, just to blackmail you that you have to pay if you want it back to its original, and freely available, high definition. This is not even clearly mentioned and unless you will read some of these reviews and many complaints on the internet, you will not know what's going on in the background. Go google for the QR code block and other complaints on this extension. But there is more: This extension has an extremely annoying popup that not even firefox or addons such as uOrigin or others will be able to block, any time there is an update. IT is extremely annoying because it steals the focus of whatever you are watching, be it a full screen movie or your bank website, or if you are in the middle of a transaction or booking a flight, etc., the violent and frankly useless window jumps with some "Congratulations" message that will disrupt you and certainly cause rage in many cases. The message is actually quite stupid because nobody on the planet will believe that he/she deserves to be "congratulated" for some code update. If every code in the computer would "congratulate" you in such way, computers would have die long time ago: You have hundreds of thousands of files, libraries and applications --free or otherwise-- that get updated every single minute every day. Shame on this developer, this is the kind of developers that don't care for user experience and do not want to be transparent. Look for alternatives. youtube-dl is great and youtube-dl-gui is the perfect partner. And there are more.