Karaoke Pitch
A very simple open-source browser extension called Karaoke Pitch that lets you adjust the pitch of a YouTube video and optionally store that chosen pitch for later. https://github.com/djeastm/karaoke-pitch Firefox: https://addons.mozilla.org/en-US/firefox/addon/karaoke-pitch... Chrome: https://chromewebstore.google.com/detail/karaoke-pitch/facck... The Firefox one has 12 average daily users already, so that makes it my most successful side project ever haha.