diff --git a/css/userContent-files/webextension-tweaks/ultrawide_video.css b/css/userContent-files/webextension-tweaks/ultrawide_video.css
new file mode 100644
index 0000000..eb39c8b
--- /dev/null
+++ b/css/userContent-files/webextension-tweaks/ultrawide_video.css
@@ -0,0 +1,9 @@
+/*! Alters the webextension UltraWide Video 21:9
+  IMPORTANT: change the Internal UUID */
+@-moz-document url-prefix("moz-extension://{75afe46a-7a50-4c6b-b866-c43a1075b071}/html/popup.html") {
+  html {
+    background: var(--in-content-box-background)!important;
+    color: var(--in-content-page-color)!important;
+    border: 3px solid!important
+  }
+}
diff --git a/gulpfile.js b/gulpfile.js
index aee165a..0fb8231 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -22,7 +22,7 @@ gulp.task('minify_base_code', function() {
 /* Remove internal UUIDs */
 gulp.task('remove_UUIDs', function() {
   return gulp.src('.')
-    .pipe(exec('sh scripts/uuids.sh remove'))
+    .pipe(exec('sh scripts/uuids.sh remove nogen'))
 });
 
 
diff --git a/userContent.css b/userContent.css
index c744125..78c2747 100644
--- a/userContent.css
+++ b/userContent.css
@@ -3009,6 +3009,15 @@ body.colorBlind #netFilteringDialog > .panes > .details > div[data-status="2"],
     border-color: var(--in-content-box-border-color)!important
   }
 }
+/*! Alters the webextension UltraWide Video 21:9
+  IMPORTANT: change the Internal UUID */
+@-moz-document url-prefix("moz-extension://{75afe46a-7a50-4c6b-b866-c43a1075b071}/html/popup.html") {
+  html {
+    background: var(--in-content-box-background)!important;
+    color: var(--in-content-page-color)!important;
+    border: 3px solid!important
+  }
+}
 /*! Alters the webextension uMatrix
   IMPORTANT: change the Internal UUID */
 @-moz-document url-prefix("moz-extension://uMatrix@raymondhill.net/") {
diff --git a/userContent_imports.css b/userContent_imports.css
index ed2873a..b9fa283 100644
--- a/userContent_imports.css
+++ b/userContent_imports.css
@@ -33,6 +33,7 @@
 @import "css/userContent-files/webextension-tweaks/tridactyl.css";
 @import "css/userContent-files/webextension-tweaks/ublock_origin.css";
 @import "css/userContent-files/webextension-tweaks/ubo_scope.css";
+@import "css/userContent-files/webextension-tweaks/ultrawide_video.css";
 @import "css/userContent-files/webextension-tweaks/umatrix.css";
 @import "css/userContent-files/webextension-tweaks/vim_vixen.css";
 @import "css/userContent-files/webextension-tweaks/violentmonkey.css";