diff --git a/4.2.1-User-Scripts.md b/4.2.1-User-Scripts.md
index 238edf1..33af69e 100644
--- a/4.2.1-User-Scripts.md
+++ b/4.2.1-User-Scripts.md
@@ -1,7 +1,7 @@
 We recommend [Violentmonkey](https://addons.mozilla.org/firefox/addon/violentmonkey/) or similar to run these
 
 :exclamation: These require `@run-at document-start` and may not work due to limitations in the web extensions API: as of 20-Apr-2018;
-   * Violentmonkey: all but conceal window.opener work
+   * Violentmonkey: all but conceal window.opener work, which we've made into an [extension](https://github.com/ghacksuserjs/ghacks-user.js/wiki/4.1-Extensions), see `window.opener be gone`
    * Greasemonkey : all three work with the `legacy extension` but not the 4.x+ `web extension` branch
 
 If you would like to submit any scripts to be added to this list, please post a [new issue](https://github.com/ghacksuserjs/ghacks-user.js/issues/new) for consideration, thanks. Please stick to scripts that deal with increasing security/privacy, and reducing tracking/fingerprinting.
@@ -77,6 +77,7 @@ Object.defineProperty(window,'name',{
  * 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, instead you can use the `windows.opener be gone` extension listed on the wiki [Extensions page](https://github.com/ghacksuserjs/ghacks-user.js/wiki/4.1-Extensions)
 
 ```js
 // ==UserScript==