This is perfect for downloading YouTube videos. I donated 10 bucks to get the pro features & it seems to have been worth it. Sometimes when YouTube changes something, the button might not appear – you gotta click on the extension icon & select a link in that case. Also sometimes I get a 'already processing. please wait or come back later' or similar message when selecting MP3 conversion. As a workaround, I just download the video in MP4, open that up in Audacity, then export to MP3. Can't say if that's a bug or something else. The developer seems to stay on the ball with fixing stuff, so I trust that issues will get fixed sooner or later. Overall, this is the best YouTube video downloader I've seen yet... :D