Tampermonkey script that removes scripts that block developer tools access (f12 tools)

remove_f12_blocking.js

// ==UserScript==
// @name         Remove F12 Blocking
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Removes scripts that block developer tools access
// @author       YourName
// @match        *://*/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Override addEventListener to intercept and block debugger-blocking scripts
    const originalAddEventListener = EventTarget.prototype.addEventListener;
    EventTarget.prototype.addEventListener = function(type, listener, options) {
        const modifiedListener = listener.toString();
        
        // Block common F12/dev tools detection patterns
        const blockedPatterns = [
            /keydown\s*.*?(123|event\.which\s*===\s*123|event\.keyCode\s*===\s*123)/,
            /devtoolsdetector|disable-devtool/,
            /debugger;/
        ];

        if (blockedPatterns.some(pattern => pattern.test(modifiedListener))) {
            return;
        }

        originalAddEventListener.call(this, type, listener, options);
    };

    // Prevent right-click disable scripts
    ['contextmenu', 'keydown'].forEach(event => {
        document.addEventListener(event, e => e.stopImmediatePropagation(), true);
    });

    // Block debugger statements from pausing execution
    const originalDebugger = window.Debugger;
    if (originalDebugger) {
        window.Debugger = function() {};
        window.Debugger.prototype = originalDebugger.prototype;
    }
})();