diff --git a/4.2.1-User-Scripts.md b/4.2.1-User-Scripts.md
index fe24fa7..bcc49e7 100644
--- a/4.2.1-User-Scripts.md
+++ b/4.2.1-User-Scripts.md
@@ -1,7 +1,40 @@
-We recommend [Violentmonkey](https://addons.mozilla.org/firefox/addon/violentmonkey/) or similar to run these
+We recommend [Violentmonkey](https://addons.mozilla.org/firefox/addon/violentmonkey/), [Greasemonkey](https://addons.mozilla.org/firefox/addon/greasemonkey/) or [FireMonkey](https://addons.mozilla.org/firefox/addon/firemonkey/)
 
-- ⚠️ These require `@run-at document-start` and may not work due to limitations in the web extensions API
-- ⚠️ userscripts can easily be detected - see CanvasBlocker's [Detection Tests](https://canvasblocker.kkapsner.de/test/detectionTest.html)
+👀  To test if a userscript is detected in any way, use CanvasBlocker's [Detection Tests](https://canvasblocker.kkapsner.de/test/detectionTest.html)
+
+---
+
+
+### :small_orange_diamond: window.opener be gone
+
+ * Author: [earthlng](https://github.com/earthlng)
+ * Description: See [this](https://www.ghacks.net/2017/01/24/web-security-add-relnoopener-to-external-links/) ghacks article about rel=noopener
+ * Works with: Greasemonkey and FireMonkey
+ * Test: https://mathiasbynens.github.io/rel-noopener/
+
+```js
+// ==UserScript==
+// @name               window.opener be gone
+// @description        Prevents tampering with window.opener.
+// @version            2.0
+// @match              http://*/*
+// @match              https://*/*
+// @exclude            https://www.catalog.update.microsoft.com/DownloadDialog.aspx
+// @run-at             document-start
+// Keys for GM:
+// @namespace          ghacksuserjs
+// @grant              GM.notification
+// Keys for FM:
+// @matchAboutBlank    true
+// ==/UserScript==
+
+if (window.opener !== null) {
+  window.opener = null;
+
+  GM.notification('Cleared window.opener!');
+  console.warn('Cleared window.opener @ ' + document.location.toString());
+}
+```
 
 ---
 
@@ -88,36 +121,3 @@ Object.defineProperty(window,'name',{
 ```
 </p></details>
 
----
-
-### :small_orange_diamond: Clear window.opener
-
-👼 Don't use this. Instead use earthlng 's strict [windows.opener be gone](https://github.com/earthlng/testpages/) or [CanvasBlocker](https://addons.mozilla.org/firefox/addon/canvasblocker/), which supports `window.opener` protection with whitelisting (see CB's "Window API")
-
-<details><summary>'Clear window.opener' userscript</summary><p>
-
- * Author: [earthlng](https://github.com/earthlng)
- * Description: See [this](https://www.ghacks.net/2017/01/24/web-security-add-relnoopener-to-external-links/) ghacks article about rel=noopener
- * Test: https://mathiasbynens.github.io/rel-noopener/
- * :exclamation: This does NOT (currently) work with Web Extensions
-
-
-```js
-// ==UserScript==
-// @name        Clear window.opener
-// @description Prevents tampering with window.opener.
-// @namespace   localhost
-// @include     *
-// @run-at      document-start
-// @version     1.0
-// @grant       none
-// ==/UserScript==
-
-if (window.opener != null)
-{
-window.opener = null;
-console.warn('Cleared window.opener!');
-}
-```
-</p></details>
-