Replace Numbers Everywhere

Changes 6→20, 54→60, and 58→60 on all websites

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// ==UserScript==
// @name         Replace Numbers Everywhere
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Changes 6→20, 54→60, and 58→60 on all websites
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    function replaceText(node) {
        if (node.nodeType === Node.TEXT_NODE) {
            node.textContent = node.textContent
                .replace(/\b54\b/g, '60')
                .replace(/\b58\b/g, '60')
                .replace(/\b6\b/g, '20');
        } else {
            node.childNodes.forEach(replaceText);
        }
    }

    replaceText(document.body);

    const observer = new MutationObserver((mutations) => {
        mutations.forEach((mutation) => {
            mutation.addedNodes.forEach(replaceText);
        });
    });

    observer.observe(document.body, {
        childList: true,
        subtree: true
    });
})();