diff --git a/chrome/window_control_placeholder_support.css b/chrome/window_control_placeholder_support.css
index 6926cba..a86dcaa 100644
--- a/chrome/window_control_placeholder_support.css
+++ b/chrome/window_control_placeholder_support.css
@@ -34,9 +34,12 @@ See the above repository for updates as well as full license text. */
   }
 }
 @media (-moz-platform: macos){
-  :root:is([tabsintitlebar],[sizemode="fullscreen"]) {
+  :root:is([tabsintitlebar]) {
     --uc-window-control-width: 72px;
   }
+  :root:is([tabsintitlebar][sizemode="fullscreen"]) {
+    --uc-window-control-width: 0;
+  }
 }
 
 .titlebar-buttonbox, #window-controls{ color: var(--toolbar-color) }