--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -693,18 +693,18 @@ html|*.urlbar-input:-moz-lwtheme::placeh
   min-height: 0;
   padding: 0;
 }
 
 %include ../shared/tabs.inc.css
 
 @media (-moz-windows-default-theme: 0) {
   /* For high contrast themes. */
-  tabbrowser,
-  :root[privatebrowsingmode=temporary] tabbrowser {
+  #tabbrowser-tabpanels,
+  :root[privatebrowsingmode=temporary] #tabbrowser-tabpanels {
     background-color: -moz-default-background-color;
   }
 }
 
 /* tabbrowser-tab focus ring */
 .tabbrowser-tab:focus > .tab-stack > .tab-content {
   outline: 1px dotted;
   outline-offset: -6px;