Remove the firefox warning on Hegarty Maths

hegartyMaths-Firefox.js

// ==UserScript==
// @name         Firefox Still works
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Firefox Still works
// @author       Aikufurr
// @match        https://hegartymaths.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    while (true) {
        try {
            var x = document.getElementById("ff-message");
            x.remove();
            break;
        }
        catch(e){
        }
    }
})();