diff --git a/homeManagerModules/firefox/custom-css/style.scss b/homeManagerModules/firefox/custom-css/style.scss
index 91c0c173..2d097c92 100644
--- a/homeManagerModules/firefox/custom-css/style.scss
+++ b/homeManagerModules/firefox/custom-css/style.scss
@@ -3,6 +3,7 @@
     --tab-height-personal: 43px !important;
     --uc-tab-corner-height: 41px !important;
     --my-vertical-toolbar-width: 46px !important;
+    --uc-margin-left-right: -1px !important; // Fix left tab margin on desktop
 }
 
 // Put main menu under logo