Greasemonkey user script to stop Web page visibility tracking (e.g. forcing a video to stop if its tab is not in focus)

stop-visibility-tracking.user.js

// ==UserScript==
// @name         Stop visibility tracking
// @namespace    https://alexandre.alapetite.fr/
// @description  Stop Web page visibility tracking (e.g. forcing a video to stop if its tab is not in focus)
// @version      1.0
// @grant        none
// @match        https://example.net/*
// ==/UserScript==

//NB: You should manually add the Web sites you want to target in your user-specific inclusion list.

window.addEventListener('visibilitychange', function (event) { event.stopImmediatePropagation(); }, true);
window.addEventListener('blur', function (event) { event.stopImmediatePropagation(); }, true);
window.addEventListener('mouseleave', function (event) { event.stopImmediatePropagation(); }, true);