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Remove Facebook Video Advertisements

Prevents Facebook advertisements playing while watching videos on facebook.

// ==UserScript==
// @name         Remove Facebook Video Advertisements
// @namespace    https://greasyfork.org/en/scripts/462105-remove-facebook-video-advertisements
// @version      1.0.0
// @description  Prevents Facebook advertisements playing while watching videos on facebook.
// @author       Daile Alimo
// @match        https://www.facebook.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=facebook.com
// @license      MIT
// @grant        none
// ==/UserScript==

// Stops advertisements playing during a video.
// Hides the video overlay, this is done because since event doesn't propergate Facebook does not know the video has stopped buffering and will show a buffering icon over the video.
window.addEventListener('playing', function(event) {
   event.stopImmediatePropagation();
   event.target.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.childNodes[1].childNodes[0].childNodes[0].setAttribute('hidden', 'hidden');
}, true);

// Stops advertisments playing at the end of a video.
// Makes the video overlay visable again.
window.addEventListener('ended', function(event) {
   event.stopImmediatePropagation();
   event.target.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.childNodes[1].childNodes[0].childNodes[0].removeAttribute('hidden');
}, true);