Blocks annoying page-load alert boxes during the first 5 seconds
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// ==UserScript==
// @name Disable JavaScript Alert Boxes
// @namespace RGlzYWJsZSBqYXZhc2NyaXB0IGFsZXJ0IGJveGVz
// @version 1.1
// @description Blocks annoying page-load alert boxes during the first 5 seconds
// @author smed79
// @license GPLv3
// @icon https://i25.servimg.com/u/f25/11/94/21/24/x10.jpg
// @include *://*/*
// @run-at document-start
// @grant none
// ==/UserScript==
(function() {
'use strict';
// Inject directly into the Main World so we actually intercept the page's alerts
const payload = `(function() {
try {
// Keep a private, hidden reference to the original alert
const originalAlert = window.alert;
// Override the page's alert function to do absolutely nothing
window.alert = function() {};
// Restore the original alert after 5 seconds
setTimeout(() => {
window.alert = originalAlert;
}, 5000);
} catch (e) {}
})();`;
// Create the script tag
const script = document.createElement('script');
script.textContent = payload;
// Inject instantly at document-start before the website's spam scripts run
if (document.documentElement) {
document.documentElement.appendChild(script);
script.remove(); // Clean up the tag so the website doesn't know we are there
}
})();