Add 'Old Wikipedia Design'

Wikipedia/OldDesign.user.js

@@ -0,0 +1,33 @@
+// ==UserScript==
+// @name         Old Wikipedia Design
+// @description  Reverts to the old Vector design.
+// @author       Vusys, chylex
+// @version      1
+// @license      MIT
+// @namespace    https://chylex.com
+// @homepageURL  https://github.com/chylex/Userscripts
+// @supportURL   https://github.com/chylex/Userscripts/issues
+// @include      https://*.wikipedia.org/*
+// @exclude      https://*.wikipedia.org/
+// @run-at       document-end
+// @grant        none
+// ==/UserScript==
+
+(function() {
+	function fixUrl(href) {
+		const url = new URL(href);
+		url.searchParams.set("useskin", "vector");
+		return url.href;
+	}
+	
+	if (!window.location.search.includes("useskin=")) {
+		location.replace(fixUrl(window.location.href));
+		return;
+	}
+	
+	for (const a of document.getElementsByTagName("a")) {
+		if (a.hostname.includes("wikipedia.org")) {
+			a.href = fixUrl(a.href);
+		}
+	}
+})();