Pause or mute HTML5 audio/video on leaving a tab and restore them back on returning.
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// ==UserScript==
// @name Pause/Mute HTML5 Audio/Video On Leaving Tab
// @namespace PauseMuteHTML5AudioVideoAudioOnLeavingTab
// @version 1.0.3
// @license AGPL v3
// @author jcunews
// @description Pause or mute HTML5 audio/video on leaving a tab and restore them back on returning.
// @website https://greatest.deepsurf.us/en/users/85671-jcunews
// @include *://*/*
// @grant none
// ==/UserScript==
(() => {
//=== Configuration Start ===
var muteInsteadOfPause = false; //set to `true` to mute instead of pause
//=== Configuration End ===
var sHidden, sVisibilityChange, elements;
if ("undefined" !== typeof document.hidden) {
sHidden = "hidden";
sVisibilityChange = "visibilitychange";
} else if ("undefined" !== typeof document.webkitHidden) {
sHidden = "webkitHidden";
sVisibilityChange = "webkitvisibilitychange";
} else if ("undefined" !== typeof document.msHidden) {
sHidden = "msHidden";
sVisibilityChange = "msvisibilitychange";
}
function checkStatus() {
if (!document[sHidden]) {
if (elements) {
elements.forEach(function(v) {
if (muteInsteadOfPause) {
v.muted = false;
} else v.play();
});
}
} else {
elements = Array.prototype.slice.call(document.querySelectorAll("audio, video")).filter(
function(v) {
if (muteInsteadOfPause) {
if (!v.muted) {
v.muted = true;
return true;
}
} else if (!v.paused) {
v.pause();
return true;
}
return false;
}
);
}
}
function init() {
document.removeEventListener(sVisibilityChange, checkStatus);
document.addEventListener(sVisibilityChange, checkStatus);
}
//Support for Structured Page Fragments. For e.g. YouTube
addEventListener("spfdone", init);
init();
})();