diff --git a/src/other/firefox/chrome/WhiteSur/rounded-window-maximized.css b/src/other/firefox/chrome/WhiteSur/rounded-window-maximized.css
index ff05099..1f969c3 100644
--- a/src/other/firefox/chrome/WhiteSur/rounded-window-maximized.css
+++ b/src/other/firefox/chrome/WhiteSur/rounded-window-maximized.css
@@ -1,5 +1,5 @@
 @namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
-:root[tabsintitlebar]:not([inFullscreen]) #nav-bar {
-	border-radius: 16px 16px 0 0;
+:root[tabsintitlebar]:not([inFullscreen])[sizemode="maximized"] #nav-bar {
+	border-radius: 16px 16px 0 0 !important;
 }