diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
index e6ef8578b460282eeb473f78c71addc43192e228..2c7418f6eb416a58166287e2c6a37c22ee12d6ea 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;
       }
     }
   }
@@ -58,7 +57,8 @@
       -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);
@@ -66,13 +66,11 @@
 
       /* 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);
         }