Greasemonkey module to disable tabswtich detection

My_BYPASS

// ==UserScript==
// @name         Match Every Site
// @namespace    https://targetwebsite.com/
// @version      1.1
// @description  Bypass fullscreen/tabswtich/invisbility screen
// @author       Dev
// @match        *://*/*
// @grant       unsafeWindow
// ==/UserScript==

unsafeWindow.document.hasFocus = function () {return true;};
Object.defineProperty(document, "hidden", { value : false});
document.visibilityState="visible";
unsafeWindow.document.visibilityState="visible";
delete window.document.referrer;
        window.document.__defineGetter__('referrer', function () {
            return "https://targetwebsite.com/";
});

for (event_name of ["visibilitychange", "webkitvisibilitychange", "blur"]) {
  window.addEventListener(event_name, function(event) {
        event.stopImmediatePropagation();
    }, true);
}
for (event_name of ["visibilitychange", "webkitvisibilitychange", "blur"]) {
  unsafeWindow.addEventListener(event_name, function(event) {
        event.stopImmediatePropagation();
    }, true);
}
alert("ASD");

module to be run with Greasemonkey

Test website:
https://davidwalsh.name/demo/page-visibility.php