FlatMMO - Hide XP Bars

Hides XP progress bar overlay on FlatMMO
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// ==UserScript==
// @name         FlatMMO - Hide XP Bars
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Hides XP progress bar overlay on FlatMMO
// @match        https://flatmmo.com/play.php
// @match        https://flatmmo.com/g/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    const script = document.createElement('script');
    script.textContent = `
        function killXPBars() {
            if (typeof xp_progress_bar_top_right !== 'undefined') {
                xp_progress_bar_top_right = new Proxy({}, {
                    get() { return undefined; },
                    set() { return true; },
                    has() { return false; },
                    ownKeys() { return []; }
                });
                // Also kill the floating +xp text and level up drops
                paint_xp_drops = function() {};
                paint_level_drops = function() {};
                console.log('[FlatMMO XP] xp_progress_bar_top_right killed.');
            } else {
                setTimeout(killXPBars, 100);
            }
        }
        killXPBars();
    `;
    (document.head || document.documentElement).appendChild(script);
    script.remove();
})();