Session Protector

Prevent websites from modifying or deleting session cookies

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// ==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
    });
})();