diff --git a/4.2.1-User-Scripts.md b/4.2.1-User-Scripts.md
deleted file mode 100644
index 1540d50..0000000
--- a/4.2.1-User-Scripts.md
+++ /dev/null
@@ -1,33 +0,0 @@
-some scripts... tested in [Firemonkey](https://addons.mozilla.org/firefox/addon/firemonkey/) only.<br><br>
-Scripts with `@run-at  document-start` don't work reliable enough with Greasemonkey (as of GM 4.9)!
-
----
-
-### :small_orange_diamond: window.opener be gone
-
- * Author: [earthlng](https://github.com/earthlng)
- * Test: https://mathiasbynens.github.io/rel-noopener/
-
-```js
-// ==UserScript==
-// @name               window.opener be gone
-// @description        Prevents tampering with window.opener.
-// @version            2.1
-// @match              http://*/*
-// @match              https://*/*
-// @exclude            https://www.catalog.update.microsoft.com/DownloadDialog.aspx
-// @run-at             document-start
-// @namespace          arkenfox
-// @grant              GM.notification
-// Keys for FM:
-// @allFrames          true
-// @matchAboutBlank    true
-// ==/UserScript==
-
-if (window.opener !== null) {
-  window.opener = null;
-
-  GM.notification('Cleared window.opener!');
-  console.warn('Cleared window.opener @ ' + document.location.toString());
-}
-```