Add two download buttons to YouTube videos that allow you to download MP3 or Video without leaving the page with the option to choose the quality.
< 脚本 Simple YouTube MP3/VIDEO Buttons 的反馈
Never mind, YouTube borked their shit again. 
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Oh hey, it actually works.
I use the YouTube Links script for general use (because it puts download links by the video thumbnails), but it seems to be unable to download videos that YouTube's content ID system (which I hate immensely by the way) detects as having music in it. So, I needed to find a newer script that doesn't have that problem. After sorting through multiple scripts that either straight-up did nothing or tried to redirect to some BS external site, I was feeling pretty pessimistic. Then I tried this one, and it actually worked on the video that was giving YouTube Links trouble before. I'll still probably prefer YouTube Links for general use, but I'm glad I finally have a reliable backup.