Adds a MP3 Download button next to the subscribe button, thanks to youtubeinmp3 for their simple download service (http://youtubeinmp3.com/api/). Based off magnus's youtube2mp3 code. Just used something different as it wont open another tab.
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HTTPS work around
I made it so the URL is replaced by the http protocol on page load, so no more manual protocol fixing.
https://gf.qytechs.cn/en/scripts/11718-youtube-mp3-download-button-https