diff --git a/css/userContent-files/webextension-tweaks/generic_style.css b/css/userContent-files/webextension-tweaks/generic_style.css
index 49f5f53..b1b7e19 100644
--- a/css/userContent-files/webextension-tweaks/generic_style.css
+++ b/css/userContent-files/webextension-tweaks/generic_style.css
@@ -4,7 +4,8 @@
                url-prefix("moz-extension://decentraleyes_UUID/pages/popup"),
                url-prefix("moz-extension://smart_https_UUID/data/data/popup.html"),
                url-prefix("moz-extension://rename_tab_title_UUID/popup/popup.html"),
-               url-prefix("moz-extension://open_in_new_tab_UUID/popup") {
+               url-prefix("moz-extension://open_in_new_tab_UUID/popup"),
+               url-prefix("moz-extension://greasemonkey_UUID/src/browser/monkey-menu") {
   :root {
     --in-content-page-background: var(--tone-6)!important;
     --in-content-box-background: rgba(11,11,12,0.2)!important;
@@ -51,6 +52,8 @@
                url-prefix("moz-extension://open_in_new_tab_UUID/"),
                url-prefix("moz-extension://display_anchors_UUID/"),
                url-prefix("moz-extension://rename_tab_title_UUID/"),
+               url-prefix("moz-extension://greasemonkey_UUID/src/browser/monkey-menu"),
+
                url-prefix("moz-extension://generic_styling_1_UUID"),
                url-prefix("moz-extension://generic_styling_2_UUID"),
                url-prefix("moz-extension://generic_styling_3_UUID"),
@@ -134,7 +137,8 @@
 /*! Code Mirror */
 @-moz-document url-prefix("moz-extension://violentmonkey_UUID/"),
                url-prefix("moz-extension://ublock_origin_UUID/"),
-               url-prefix("moz-extension://umatrix_UUID/") {
+               url-prefix("moz-extension://umatrix_UUID/"),
+               url-prefix("moz-extension://greasemonkey_UUID/src/content/edit-user-script") {
   .CodeMirror {
      border: 1px solid !important;
      border-color: var(--cm-background)!important;
diff --git a/css/userContent-files/webextension-tweaks/greasemonkey.css b/css/userContent-files/webextension-tweaks/greasemonkey.css
new file mode 100644
index 0000000..1ab828c
--- /dev/null
+++ b/css/userContent-files/webextension-tweaks/greasemonkey.css
@@ -0,0 +1,28 @@
+@-moz-document url-prefix("moz-extension://greasemonkey_UUID/") {
+  html,
+  body {
+    background: var(--in-content-page-background) !important;
+  }
+  #tabs .tab.active,
+  .command-item {
+    background: var(--tone-8) !important;
+    color: var(--in-content-page-color) !important;
+  }
+  .subview-back::before {
+    content: url(/skin/back.svg);
+    filter: invert(65%);
+  }
+  .subview-back:hover,
+  .subview-back:focus,
+  .subview-item:hover,
+  .subview-item:focus {
+    background-color: var(--in-content-category-background-hover) !important;
+    cursor: default;
+    color: inherit;
+    text-decoration: none;
+  }
+  .subview-item .text,
+  .subview-item .icon {
+    background: transparent !important;
+  }
+}
diff --git a/scripts/webextension_mappings.txt b/scripts/webextension_mappings.txt
index c2cc661..b345f32 100644
--- a/scripts/webextension_mappings.txt
+++ b/scripts/webextension_mappings.txt
@@ -12,6 +12,7 @@ display_anchors|display-anchors@robwu.nl
 enhancer_for_youtube_UUID|enhancerforyoutube@maximerf.addons.mozilla.org
 flash_and_video_download_UUID|{bee6eb20-01e0-ebd1-da83-080329fb9a3a}
 google_translator_for_firefox|translator@zoli.bod
+greasemonkey|{e4a8a97b-f2ed-450b-b12d-ee082ba24781}
 https_everywhere|https-everywhere@eff.org
 mind_the_time|jid0-HYNmqxA9zQGfJADREri4n2AHKSI@jetpack
 multi_account_containers|@testpilot-containers
diff --git a/userContent_imports.css b/userContent_imports.css
index 3f09dc5..9192fd8 100644
--- a/userContent_imports.css
+++ b/userContent_imports.css
@@ -18,6 +18,7 @@
 @import "css/userContent-files/webextension-tweaks/brief.css";
 @import "css/userContent-files/webextension-tweaks/cookie_autodelete.css";
 @import "css/userContent-files/webextension-tweaks/dark_mode.css";
+@import "css/userContent-files/webextension-tweaks/greasemonkey.css";
 @import "css/userContent-files/webextension-tweaks/multi_account_containers.css";
 @import "css/userContent-files/webextension-tweaks/noscript.css";
 @import "css/userContent-files/webextension-tweaks/pocket.css";