MP4 killer

// ==UserScript==
// @name         MP4 killer
// @namespace    2ch
// @version      0.0.1
// @description  Remove all MP4
// @author       AHOHNMYC
// @match        https://2ch.hk/*
// @grant        none
// ==/UserScript==

function killMP4(){
    let iterator = document.evaluate('//a[contains(@href,"mp4")]/../../..', document, null, XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null),
        t, a = [];
    while (( t = iterator.iterateNext() )) a.push(t);
    a.forEach( el=>el.remove() );
}
new MutationObserver(killMP4).observe(document.getElementById('ABU-alertbox'), {childList: true});
killMP4();