Replace Reddit Links with Old Reddit

Changes Reddit links to old.reddit.com directly in the DOM, preventing redirects.

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// ==UserScript==
// @name        Replace Reddit Links with Old Reddit
// @namespace   https://greasyfork.org/en/users/1396030-99xpotions
// @match       *://*/*
// @grant       none
// @version     1.0.1
// @author      99xPotions
// @license     MIT
// @description Changes Reddit links to old.reddit.com directly in the DOM, preventing redirects.
// ==/UserScript==

(function() {
    'use strict';

    function replaceRedditLinks() {
        const links = document.querySelectorAll('a[href*="reddit.com"]');
        
        links.forEach(link => {
            try {
                const url = new URL(link.href);
                if (url.hostname === 'www.reddit.com' || url.hostname === 'reddit.com') {
                    url.hostname = 'old.reddit.com';
                    link.href = url.href;
                }
            } catch (e) {
            }
        });
    }

    replaceRedditLinks();

    const observer = new MutationObserver(function(mutations) {
        let newNodesAdded = false;
        
        for (let i = 0; i < mutations.length; i++) {
            if (mutations[i].addedNodes.length > 0) {
                newNodesAdded = true;
                break;
            }
        }
        
        if (newNodesAdded) {
            replaceRedditLinks();
        }
    });

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