scroll problems

[Admini]

I think I found it, I have a script in tampermonkey to disable all these annoying "close this page" popups,
here's the code:

Code:

// ==UserScript== // @name kill_beforeunload // @namespace Violentmonkey Scripts // @include     * // @grant none // @run-at document-start // ==/UserScript== // EventTarget.prototype.addEventListenerBase = EventTarget.prototype.addEventListener; EventTarget.prototype.addEventListener = function(type, listener)    {      if(type=="beforeunload") {          return; //ignore attempts to add a beforeunload event      }      this.addEventListenerBase(type, listener); //treat all other events normally }; function unsetOnBeforeUnload() {    window.onbeforeunload = function(event) {};    setTimeout(unsetOnBeforeUnload, 300); //optional, but some pages might set the event later in the page's lifecycle } document.addEventListener("DOMContentLoaded", unsetOnBeforeUnload);

I disabled it for youtube and now scrolling works when I switch to new comments for example,
which was impossible to work without that

I think there is dead loop in this script.