diff --git a/4.1-Extensions.md b/4.1-Extensions.md
index 6b3c1b8..6cb1991 100644
--- a/4.1-Extensions.md
+++ b/4.1-Extensions.md
@@ -26,8 +26,9 @@ These are all, where applicable, best configured to `deny-all` and whitelist.
 * [Neat URL](https://addons.mozilla.org/firefox/addon/neat-url/) <sup>✔ [Privacy](https://addons.mozilla.org/firefox/addon/neat-url/privacy/)</sup> | [GitHub](https://github.com/Smile4ever/firefoxaddons)
 * [Skip Redirect](https://addons.mozilla.org/firefox/addon/skip-redirect/) | [GitHub](https://github.com/sblask/webextension-skip-redirect)
 * [ClearURLs](https://addons.mozilla.org/firefox/addon/clearurls/) <sup>✔ Privacy (stated on AMO)</sup> | [GitHub](https://github.com/KevinRoebert/ClearUrls)
-* [Violentmonkey](https://addons.mozilla.org/firefox/addon/violentmonkey/) | [GitHub](https://github.com/violentmonkey/violentmonkey)
+* [Violentmonkey](https://addons.mozilla.org/firefox/addon/violentmonkey/) | [GitHub](https://github.com/violentmonkey/violentmonkey) <sup>1</sup>
   * Allows you to run [User Scripts](https://github.com/ghacksuserjs/ghacks-user.js/wiki/4.2.1-User-Scripts) which can do neat things
+* [Greasemonkey](https://addons.mozilla.org/firefox/addon/greasemonkey/) <sup>✔ [Privacy](https://addons.mozilla.org/firefox/addon/greasemonkey/privacy/)</sup> | [GitHub](https://github.com/greasemonkey/greasemonkey) <sup>1</sup>
 * [Request Control](https://addons.mozilla.org/firefox/addon/requestcontrol/) | [GitHub](https://github.com/tumpio/requestcontrol) | [Manual](https://github.com/tumpio/requestcontrol/blob/master/_locales/en/manual.md) | [Testing links](https://github.com/tumpio/requestcontrol/wiki/Testing-links)
 * [Redirector](https://addons.mozilla.org/firefox/addon/redirector/) <sup>✔ [Privacy](https://github.com/einaregilsson/Redirector/blob/master/privacy.md)</sup> | [GitHub](https://github.com/einaregilsson/Redirector)
 * [Cookie AutoDelete](https://addons.mozilla.org/firefox/addon/cookie-autodelete/) <sup>✔ [Privacy](https://github.com/Cookie-AutoDelete/Cookie-AutoDelete/wiki/Privacy-Policy)</sup> | [GitHub](https://github.com/mrdokenny/Cookie-AutoDelete)
@@ -36,12 +37,12 @@ These are all, where applicable, best configured to `deny-all` and whitelist.
    * unresolved: clearing IndexedDB by host
    * unknown: clearing service workers cache, appCache by host
 
+<sup>1</sup> There are differences between GM + VM regards how they handled Web Extension capabilities / limitations, such as bypassing CSP and @run-at document-start. So TEST your scripts!
+
 ### :small_orange_diamond: Recommended Legacy Extensions
 
 * :green_heart: [NoScript 5.1.8.4](https://addons.mozilla.org/firefox/addon/noscript/versions/?page=1#version-5.1.8.4) <sup>✔ [Privacy](https://addons.mozilla.org/firefox/addon/noscript/privacy/)</sup>
    * Yes, there is a FF57+ non-legacy version. For FF57+, use uMatrix in some hardened configuration instead. This *may* not be a total replacement, as NoScript *might* offer some unique protections <sup>debatable</sup>: eg: ClearClick, ABE <sup>[see here](https://github.com/ghacksuserjs/ghacks-user.js/wiki/4.2.3-uMatrix)</sup>, XSS <sup>really debatable</sup>
-* :green_heart: [Greasemonkey 3.17](https://addons.mozilla.org/firefox/addon/greasemonkey/versions/3.17) <sup>✔ [Privacy](https://addons.mozilla.org/firefox/addon/greasemonkey/privacy/)</sup> | [GitHub](https://github.com/greasemonkey/greasemonkey)
-   * Yes, there is a FF57+ non-legacy version. For FF57+, use Violentmonkey.
 * :purple_heart: [QuickJava](https://addons.mozilla.org/firefox/addon/quickjava/) | [GitHub](https://github.com/ThatOneGuyDotNet/QuickJava) | [Extension Info](https://github.com/ThatOneGuyDotNet/QuickJava/issues/44)
   * Configurable toggle buttons for JS, ~~Java~~, Flash, images and more
 * [No Resource URI Leak (clone)](https://raw.githubusercontent.com/earthlng/testpages/master/no_resource_uri_leak-1.1.1-an%2Bfx%2Bsm%2Btb.xpi) - see [#191](https://github.com/ghacksuserjs/ghacks-user.js/issues/191) | original [here](https://addons.mozilla.org/firefox/addon/no-resource-uri-leak/) breaks <sup>[`[`bug`]`](https://notabug.org/desktopd/no-resource-uri-leak/issues/14)</sup> in FF55+ | [Cannot be ported to WE](https://addons.mozilla.org/firefox/addon/no-resource-uri-leak/reviews/860958/)