linkfix.user.js

// ==UserScript==
// @name         Fix chat visited links being silly little binguses
// @namespace    http://tampermonkey.net/
// @version      1
// @author       lyxal
// @match        https://chat.stackexchange.com/rooms/*
// @match        https://chat.stackexchange.com/transcript/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=stackexchange.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const styleSheet = document.createElement("style");
    styleSheet.type = "text/css"
    styleSheet.innerText = "a:visited {color: inherit !important;}";
    document.head.appendChild(styleSheet)
})();