force facebook 2020 interface to use the light theme

force-fb-light.user.js

// ==UserScript==
// @name         Force Facebook to use the light theme.
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.facebook.com/*
// @grant        none
// @run-at       document-idle
// @require      https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js
// ==/UserScript==

(function() {
    'use strict';
    var $ = window.$;
    var a;
   // $(document).ready(
        a = setInterval(
            (function(){
                $('#facebook').attr('class', $('#facebook').attr('class').replace('dark', 'light'))
                if($('#facebook').attr('class') == $('#facebook').attr('class').replace('dark', 'light')){
                    clearInterval(a);
                }
            }),
            50
        )
    //)
})();

This is not optimal, it works but it takes some time. Refinements welcome.