google-search-url-cleaner.user.js

// ==UserScript==
// @name         Cleanup Google Search URLs
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Deactivate Google Search Tracking
// @author       You
// @match        https://*.google.de/search*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=google.de
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let newUrl = window.location.href.split('&')[0];
    window.history.replaceState({},'', newUrl);
})();