Script that redirects shitty sites to good sites

redirects.user.js

// ==UserScript==
// @name         Redirects
// @author       You
// @match        *://*/*
// ==/UserScript==

(function() {
    'use strict'

    const redirections = new Map([
        ['doom.fandom.com', 'doomwiki.org'],
        ['wowwiki.fandom.com/wiki', 'wow.gamepedia.com'],
        ['oldschoolrunescape.fandom.com/wiki', 'oldschool.runescape.wiki/w'],
        ['runescape.fandom.com/wiki', 'runescape.wiki/w'],
        ['half-life.fandom.com', 'combineoverwiki.net'],
        ['www.reddit.com', 'old.reddit.com'],
    ])

    for (const [from, to] of redirections) {
        if (window.location.href.indexOf('http://' + from) === 0 ||
                window.location.href.indexOf('https://' + from) === 0) {
            window.location = window.location.href.replace(from, to)
            break
        }
    }
})();