This browser addon works great: https://github.com/gantt/downloadyoutube
MediaHuman also makes one I’ve used: http://www.mediahuman.com/youtube-downloader/
There are many other free scripts and plugins…
That being said, I usually use the Softorino one mentioned in the article because it is by far the best. It allows 4k video downloads, various formats and targets, including ripping as audio to mp3 and m4a with embedded meta data and album art, and can even send the videos or audio directly to your iPhone without iTunes. The same company makes Waltr which takes the pain out of loading media to an iPhone and is so much better at loading then iTunes, it can even load media over wifi. Apple could learn a lot from these folks. Good software. I seldom recommend software, but their software is worth every cent.
This software does downloading, conversion, and loading, it is a much more complete tool then most others.
