There is a multitude of browser add-ons and extensions available for downloading YouTube videos or converting to mp3 that are usually somewhat obscure, but there is actually nothing more needed than the popular VLC player. Here is how!
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For attribution, please cite this work as
Schmalfuss (2018, May 5). OS DataMercs: download YouTube (videos | mp3) without browser extension using only VLC. Retrieved from https://www.datamercs.net/posts/2018-05-05-download-youtube-using-only-vlc/
BibTeX citation
@misc{schmalfuss2018download,
author = {Schmalfuss, Olaf},
title = {OS DataMercs: download YouTube (videos | mp3) without browser extension using only VLC},
url = {https://www.datamercs.net/posts/2018-05-05-download-youtube-using-only-vlc/},
year = {2018}
}