Forces Page Visibility API to "visible" on selected domains so background video/audio keeps playing.
// ==UserScript==
// @name Mobile Browser Background Video
// @namespace mobile-browser-background-video
// @version 1.0.0
// @description Forces Page Visibility API to "visible" on selected domains so background video/audio keeps playing.
// @license GPL-3.0-or-later
// @match *://amazon.com/*
// @match *://*.amazon.com/*
// @match *://amazon.de/*
// @match *://*.amazon.de/*
// @match *://audible.com/*
// @match *://*.audible.com/*
// @match *://audible.de/*
// @match *://*.audible.de/*
// @match *://brightcove.com/*
// @match *://*.brightcove.com/*
// @match *://coursera.org/*
// @match *://*.coursera.org/*
// @match *://dailymotion.com/*
// @match *://*.dailymotion.com/*
// @match *://disneyplus.com/*
// @match *://*.disneyplus.com/*
// @match *://facebook.com/*
// @match *://*.facebook.com/*
// @match *://instagram.com/*
// @match *://*.instagram.com/*
// @match *://jwplayer.com/*
// @match *://*.jwplayer.com/*
// @match *://loom.com/*
// @match *://*.loom.com/*
// @match *://metacafe.com/*
// @match *://*.metacafe.com/*
// @match *://mixcloud.com/*
// @match *://*.mixcloud.com/*
// @match *://netflix.com/*
// @match *://*.netflix.com/*
// @match *://spotify.com/*
// @match *://*.spotify.com/*
// @match *://primevideo.com/*
// @match *://*.primevideo.com/*
// @match *://soundcloud.com/*
// @match *://*.soundcloud.com/*
// @match *://streamable.com/*
// @match *://*.streamable.com/*
// @match *://tiktok.com/*
// @match *://*.tiktok.com/*
// @match *://tv.apple.com/*
// @match *://*.tv.apple.com/*
// @match *://twitch.tv/*
// @match *://*.twitch.tv/*
// @match *://twitter.com/*
// @match *://*.twitter.com/*
// @match *://udemy.com/*
// @match *://*.udemy.com/*
// @match *://vidyard.com/*
// @match *://*.vidyard.com/*
// @match *://vimeo.com/*
// @match *://*.vimeo.com/*
// @match *://x.com/*
// @match *://*.x.com/*
// @match *://youtube-nocookie.com/*
// @match *://*.youtube-nocookie.com/*
// @match *://youtube.com/*
// @match *://*.youtube.com/*
// @run-at document-start
// @grant none
// ==/UserScript==
(() => {
'use strict';
// ============================================================
// SETTINGS (User configurable)
// ============================================================
const CFG = {
ENABLED: true,
// Allow running inside iframes/embeds (recommended for many video players)
ALLOW_IFRAMES: true,
// Runtime whitelist (suffix match: "youtube.com" matches "m.youtube.com")
HOST_SUFFIXES: [
// 'your-domain.tld',
'amazon.com',
'amazon.de',
'audible.com',
'audible.de',
'brightcove.com',
'coursera.org',
'dailymotion.com',
'disneyplus.com',
'facebook.com',
'instagram.com',
'jwplayer.com',
'loom.com',
'metacafe.com',
'mixcloud.com',
'netflix.com',
'spotify.com',
'primevideo.com',
'soundcloud.com',
'streamable.com',
'tiktok.com',
'tv.apple.com',
'twitch.tv',
'twitter.com',
'udemy.com',
'vidyard.com',
'vimeo.com',
'x.com',
'youtube-nocookie.com',
'youtube.com',
],
// Core: Spoof Page Visibility API (no event-blocking)
SPOOF_VISIBILITY: true,
// Optional: synthetic activity to keep some sites "awake"
// Disabled by default because it can cause UI side effects (hover/tooltips).
SYNTHETIC_ACTIVITY: false,
// Synthetic activity tuning
ACTIVITY_INTERVAL_MS: 60_000, // every 60s
ACTIVITY_MIN_INTERVAL_MS: 5_000, // safety floor
};
// ============================================================
// Basic guards
// ============================================================
if (!CFG.ENABLED) return;
if (!CFG.ALLOW_IFRAMES && window.top !== window.self) return;
const host = (location.hostname || '').toLowerCase();
const isTargetHost = CFG.HOST_SUFFIXES.some((sfx) => {
sfx = (sfx || '').toLowerCase().trim();
return sfx && (host === sfx || host.endsWith('.' + sfx));
});
if (!isTargetHost) return;
// ============================================================
// Visibility spoofing (ONLY spoofing, no visibilitychange blocking)
// ============================================================
const STATE_VISIBLE = 'visible';
function safeDefine(obj, prop, desc) {
try {
Object.defineProperty(obj, prop, desc);
return true;
} catch (_) {
return false;
}
}
function installVisibilitySpoof() {
if (!CFG.SPOOF_VISIBILITY) return;
// Prefer prototype (works for most sites)
const protoOK1 = safeDefine(Document.prototype, 'visibilityState', {
configurable: true,
enumerable: true,
get: () => STATE_VISIBLE,
});
const protoOK2 = safeDefine(Document.prototype, 'hidden', {
configurable: true,
enumerable: true,
get: () => false,
});
// WebKit aliases
const protoOK3 = safeDefine(Document.prototype, 'webkitVisibilityState', {
configurable: true,
enumerable: true,
get: () => STATE_VISIBLE,
});
const protoOK4 = safeDefine(Document.prototype, 'webkitHidden', {
configurable: true,
enumerable: true,
get: () => false,
});
// Fallback: patch document instance if prototype was blocked
if (!protoOK1) {
safeDefine(document, 'visibilityState', { configurable: true, get: () => STATE_VISIBLE });
}
if (!protoOK2) {
safeDefine(document, 'hidden', { configurable: true, get: () => false });
}
if (!protoOK3) {
safeDefine(document, 'webkitVisibilityState', { configurable: true, get: () => STATE_VISIBLE });
}
if (!protoOK4) {
safeDefine(document, 'webkitHidden', { configurable: true, get: () => false });
}
}
// ============================================================
// Synthetic user activity (optional)
// ============================================================
let activityTimer = null;
function emitSyntheticActivity() {
try {
const w = window.innerWidth || 360;
const h = window.innerHeight || 640;
const x = Math.max(1, Math.min(w - 2, Math.floor(w * 0.5 + (Math.random() - 0.5) * 40)));
const y = Math.max(1, Math.min(h - 2, Math.floor(h * 0.5 + (Math.random() - 0.5) * 40)));
window.dispatchEvent(new MouseEvent('mousemove', {
bubbles: true,
cancelable: false,
clientX: x,
clientY: y,
screenX: x,
screenY: y,
}));
if (typeof PointerEvent === 'function') {
window.dispatchEvent(new PointerEvent('pointermove', {
bubbles: true,
cancelable: false,
clientX: x,
clientY: y,
pointerId: 1,
pointerType: 'mouse',
isPrimary: true,
}));
}
} catch (_) {
// ignore
}
}
function startActivityTick() {
if (!CFG.SYNTHETIC_ACTIVITY) return;
// Safe integer conversion (avoid bitwise casts like "|0")
const requested = Math.floor(Number(CFG.ACTIVITY_INTERVAL_MS));
const interval = Math.max(
CFG.ACTIVITY_MIN_INTERVAL_MS,
Number.isFinite(requested) ? requested : 0
);
activityTimer = window.setInterval(emitSyntheticActivity, interval);
window.setTimeout(emitSyntheticActivity, 1500);
}
// ============================================================
// Init
// ============================================================
installVisibilitySpoof();
startActivityTick();
// Optional debug marker
try { window.__BGVIDEO_ALWAYS_VISIBLE__ = true; } catch (_) {}
})();