GitHub - AddonDeveloper/youtube-to-mp3-userscript: The 320 kbps YouTube mp3 userscript generates a 320 kbps - MP3 DOWNLOAD button on YouTube.com. Convert YouTube to mp3 and download the file to your device.
YouTube mp3 Downloader – Get this Extension for 🦊 Firefox (en-US)
Top 9 YouTube to MP3 320 Online Converters [2023 Updated!]