Override XMLHttpRequest

ajaxOverride.js

(function(send) {
  XMLHttpRequest.prototype.send = function () {
    var callback = this.onreadystatechange
    this.onreadystatechange = function() {
      if (this.readyState == 4) {
        var responseURL = this.responseURL
        if (responseURL.match(/https?:\/\/www\.youtube\.com\/watch\?v=.*/g)) {
          console.log(responseURL)
        }
      }
      if (callback) {
        callback.apply(this, arguments)
      }
    }
    send.apply(this, arguments)
  }
}(XMLHttpRequest.prototype.send))