Check for duplicate scripts on a page using Chrome DevTools

check-duplicate-scripts.js

// Paste into Chrome DevTools console
var scripts = document.getElementsByTagName('script');
var srcList = [];
for (var i = 0; i < scripts.length; i++) {
  if (scripts[i].src) srcList.push(scripts[i].src.split('?')[0]);
}
var duplicates = srcList.filter((item, index) => srcList.indexOf(item) !== index);
console.log("Duplicate Scripts Found:", duplicates.length ? duplicates : "None!");