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// Ensure the video you want to download is playing before you copy this script into the
// developer tools console of the browser and hit the return key. It will extract the raw
// video URL on websites that use no advanced techniques. If you get an URL that starts
// with 'blob:' you are out of luck. When multiple videos are present, this code will
// choose the one with the largest canvas.
 
let videos = Array.from(document.querySelectorAll('video'));
videos.sort((a,b) => -a.clientHeight*a.clientWidth+b.clientHeight*b.clientWidth);
console.log(videos.filter(v => !v.paused)?.[0]?.src);