--- a/browser/themes/windows/compacttheme.css
+++ b/browser/themes/windows/compacttheme.css
@@ -29,16 +29,22 @@
     background: transparent !important;
   }
 }
 
 #toolbar-menubar {
   text-shadow: none !important;
 }
 
+@media (-moz-windows-glass) {
+  .tabbrowser-tab {
+    background-color: var(--chrome-background-color);
+  }
+}
+
 @media (-moz-os-version: windows-win7),
        (-moz-os-version: windows-win8) {
   /* It'd be nice if there was an element in the scrollbox's inner content
      that collapsed to the current width of the tabs. Since there isn't we
      need to handle overflowing and non-overflowing tabs separately.
 
      In the case of overflowing tabs, set a border-top on the entire container,
      otherwise we need to set it on each element individually */