Show HN: Music video made out of browser pop-up windows (lyra.horse)

Video version: https://www.youtube.com/watch?v=RGMaINyM0ek

I usually do browser security research, but I thought it'd be fun to take the things I've learned and make something fun instead. This project was written from scratch in raw JavaScript, you can view-source on the page to see the entire source code.