// ==UserScript==
// @name         Video Background Play Fix
// @namespace    https://greasyfork.org/en/users/50-couchy
// @version      20220119
// @description  Prevents YouTube and Vimeo from pausing videos when minimizing or switching tabs. Cross-browser port of https://addons.mozilla.org/en-US/firefox/addon/video-background-play-fix/
// @author       Couchy
// @match        *://*.youtube.com/*
// @match        *://*.vimeo.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==
(function() {
'use strict';
const IS_YOUTUBE = window.location.hostname.search(/(?:^|.+\.)youtube\.com/) > -1 ||
window.location.hostname.search(/(?:^|.+\.)youtube-nocookie\.com/) > -1;
const IS_MOBILE_YOUTUBE = window.location.hostname == 'm.youtube.com';
const IS_DESKTOP_YOUTUBE = IS_YOUTUBE && !IS_MOBILE_YOUTUBE;
const IS_VIMEO = window.location.hostname.search(/(?:^|.+\.)vimeo\.com/) > -1;
const IS_ANDROID = window.navigator.userAgent.indexOf('Android') > -1;
// Page Visibility API
if (IS_ANDROID || !IS_DESKTOP_YOUTUBE) {
Object.defineProperties(document,
{ 'hidden': {value: false}, 'visibilityState': {value: 'visible'} });
}
window.addEventListener(
'visibilitychange', evt => evt.stopImmediatePropagation(), true);
// Fullscreen API
if (IS_VIMEO) {
window.addEventListener(
'fullscreenchange', evt => evt.stopImmediatePropagation(), true);
}
// User activity tracking
if (IS_YOUTUBE) {
loop(pressKey, 60 * 1000, 10 * 1000); // every minute +/- 10 seconds
}
function pressKey() {
const key = 18;
sendKeyEvent("keydown", key);
sendKeyEvent("keyup", key);
}
function sendKeyEvent (aEvent, aKey) {
document.dispatchEvent(new KeyboardEvent(aEvent, {
bubbles: true,
cancelable: true,
keyCode: aKey,
which: aKey,
}));
}
function loop(aCallback, aDelay, aJitter) {
let jitter = getRandomInt(-aJitter/2, aJitter/2);
let delay = Math.max(aDelay + jitter, 0);
window.setTimeout(() => {
aCallback();
loop(aCallback, aDelay, aJitter);
}, delay);
}
function getRandomInt(aMin, aMax) {
let min = Math.ceil(aMin);
let max = Math.floor(aMax);
return Math.floor(Math.random() * (max - min)) + min;
}
})();