Session Protector

Prevent websites from modifying or deleting session cookies

K instalaci tototo skriptu si budete muset nainstalovat rozšíření jako Tampermonkey, Greasemonkey nebo Violentmonkey.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Violentmonkey.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Userscripts.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat manažer uživatelských skriptů.

(Už mám manažer uživatelských skriptů, nechte mě ho nainstalovat!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(Už mám manažer uživatelských stylů, nechte mě ho nainstalovat!)

// ==UserScript==
// @name         Session Protector
// @namespace    http://tampermonkey.net
// @version      1.0
// @description  Prevent websites from modifying or deleting session cookies
// @author       You
// @match        *//*/*/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Store the original cookie setter
    const originalSetter = Object.getOwnPropertyDescriptor(Document.prototype, 'cookie').set;

    Object.defineProperty(document, 'cookie', {
        set: function(val) {
            // Check if the script is trying to delete the cookie
            if (val.includes('expires=Thu, 01 Jan 1970 00:00:00 GMT') || val.includes('max-age=0')) {
                console.log('Blocked cookie deletion: ', val);
                return; // Block the update
            }
            // Otherwise, allow the cookie update
            originalSetter.call(document, val);
        },
        configurable: false
    });
})();