diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
index 646cf238ebfbd5ac1826cf47f578f66aa020199f..ba5a1950f683c4d8cb836ee9cd466c0b446f2241 100644
--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -14,7 +14,6 @@
     @media (-moz-gtk-theme-family) {
       --tabs-navbar-separator-style: none;
       @media (prefers-color-scheme: light) {
-        --urlbar-box-bgcolor: #fafafa;
       }
     }
   }
@@ -43,7 +42,8 @@
       -moz-default-appearance: -moz-window-decorations;
       appearance: auto;
 
-      #navigator-toolbox,
+      #zen-main-app-wrapper,
+      #zen-browser-background,
       dialog::backdrop {
         border-top-left-radius: env(-moz-gtk-csd-titlebar-radius);
         border-top-right-radius: env(-moz-gtk-csd-titlebar-radius);
@@ -51,13 +51,11 @@
 
       /* stylelint-disable-next-line media-query-no-invalid */
       @media -moz-pref("widget.gtk.rounded-bottom-corners.enabled") {
-        #navigator-toolbox {
-          /* The body clip below covers this. */
-          border-radius: 0;
-        }
 
         body,
-        dialog::backdrop {
+        dialog::backdrop,
+        #zen-main-app-wrapper,
+        #zen-browser-background {
           /* Use an uniform clip to allow WebRender to optimize it better */
           border-radius: env(-moz-gtk-csd-titlebar-radius);
         }