https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo

https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/

You'll need a userscript extension (like tampermonkey above). Then just save the below as a script and sit back as Twitter implodes even further.

This is simple enough that it shouldn't require much explanation, but the @match line says only run this on twitter.com, and the one line of JS simply updates the domain from Twitter to Nitter.

// @name         Twitter -> Nitter Redirect
// @namespace    https://thedonald.win
// @version      0.1
// @description  Redirects Twitter to Nitter
// @author       Jemmy
// @match        *.twitter.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Updates the URL host to nitter
    window.location.host = "nitter.net";

})();