Prevents Twitch from auto-pausing or throttling video when the tab is inactive
// ==UserScript==
// @name Twitch - Keep Tab Active
// @namespace twitch-keep-tab-active
// @version 0.3.0
// @description Prevents Twitch from auto-pausing or throttling video when the tab is inactive
// @author Vikindor (https://vikindor.github.io/)
// @homepageURL https://github.com/Vikindor/twitch-keep-tab-active/
// @supportURL https://github.com/Vikindor/twitch-keep-tab-active/issues
// @license MIT
// @match https://www.twitch.tv/*
// @match https://player.twitch.tv/*
// @match https://embed.twitch.tv/*
// @grant unsafeWindow
// @run-at document-start
// ==/UserScript==
(function() {
'use strict';
const uw = unsafeWindow || window;
let lastUserGesture = 0;
const userGestureWindowMs = 1200;
const markGesture = () => { lastUserGesture = Date.now(); };
const gestureEvents = ['pointerdown','mousedown','mouseup','keydown','touchstart','click','space','keypress'];
uw.addEventListener('DOMContentLoaded', () => {
gestureEvents.forEach(ev => uw.addEventListener(ev, markGesture, {capture:true, passive:true}));
}, {once:true});
const defineConstProp = (proto, prop, val) => {
try {
const d = Object.getOwnPropertyDescriptor(proto, prop);
if (d && d.get && String(d.get).includes('tmKeepActive')) return;
Object.defineProperty(proto, prop, {
configurable: true, enumerable: true,
get: function tmKeepActive() { return val; }
});
} catch {}
};
const DocProto = (uw.Document && uw.Document.prototype) || Document.prototype;
defineConstProp(DocProto, 'hidden', false);
defineConstProp(DocProto, 'webkitHidden', false);
defineConstProp(DocProto, 'visibilityState', 'visible');
try {
Object.defineProperty(DocProto, 'hasFocus', {
configurable: true,
value: function(){ return true; }
});
} catch {}
const stopOn = new Set(['visibilitychange','webkitvisibilitychange','freeze','pagehide']);
const addSilent = (t, type) => {
try {
t.addEventListener(type, ev => { ev.stopImmediatePropagation(); }, true);
} catch {}
};
stopOn.forEach(type => addSilent(uw.document, type));
addSilent(uw, 'blur');
const HME = (uw.HTMLMediaElement || HTMLMediaElement).prototype;
const originalPause = HME.pause;
const originalPlay = HME.play;
const shouldAllowProgrammaticPause = () => (Date.now() - lastUserGesture) <= userGestureWindowMs;
Object.defineProperty(HME, 'pause', {
configurable: true,
value: function tmGuardedPause() {
if (shouldAllowProgrammaticPause()) {
return originalPause.apply(this, arguments);
}
try {
const p = originalPlay.apply(this, []);
if (p && typeof p.catch === 'function') p.catch(()=>{});
} catch {}
return;
}
});
const resumeIfPaused = (v) => {
try {
if (v && v.paused && v.readyState > 2) {
const pr = originalPlay.call(v);
if (pr && typeof pr.catch === 'function') pr.catch(()=>{});
}
} catch {}
};
new uw.MutationObserver(muts => {
for (const m of muts) {
m.addedNodes && m.addedNodes.forEach(n => {
if (n && n.nodeType === 1) {
if (n.tagName === 'VIDEO') resumeIfPaused(n);
const vids = n.querySelectorAll ? n.querySelectorAll('video') : [];
vids && vids.forEach(resumeIfPaused);
}
});
}
}).observe(uw.document.documentElement, {childList: true, subtree: true});
uw.document.addEventListener('pause', (ev) => {
const el = ev.target;
if (el instanceof uw.HTMLMediaElement) {
if (!shouldAllowProgrammaticPause()) {
try { ev.stopImmediatePropagation(); } catch {}
resumeIfPaused(el);
}
}
}, true);
const NativeIO = uw.IntersectionObserver;
if (typeof NativeIO === 'function') {
const IOProxy = function(callback, options) {
const wrapped = function(entries, observer) {
const patched = entries.map(e => {
const t = e.target;
const isVideoish = t.tagName === 'VIDEO' || t.closest?.('[data-a-target="player-overlay"],[data-a-target="player-container"]');
if (isVideoish) {
return Object.assign({}, e, {
isIntersecting: true,
intersectionRatio: 1,
boundingClientRect: t.getBoundingClientRect?.() || e.boundingClientRect,
intersectionRect: t.getBoundingClientRect?.() || e.intersectionRect,
rootBounds: e.rootBounds
});
}
return e;
});
try { return callback(patched, observer); } catch {}
};
return new NativeIO(wrapped, options);
};
IOProxy.prototype = NativeIO.prototype;
uw.IntersectionObserver = IOProxy;
}
uw.setInterval(() => {
try {
uw.dispatchEvent(new uw.MouseEvent('mousemove', {bubbles:true, clientX:0, clientY:0}));
} catch {}
}, 30000);
try { uw.navigator.wakeLock?.request?.('screen').catch(()=>{}); } catch {}
})();