diff --git a/toolkit/themes/windows/mozapps/downloads/downloads.css b/toolkit/themes/windows/mozapps/downloads/downloads.css
index 202ec016f..3f1bcbec3 100644
--- a/toolkit/themes/windows/mozapps/downloads/downloads.css
+++ b/toolkit/themes/windows/mozapps/downloads/downloads.css
@@ -111,7 +111,7 @@ richlistitem[type="download"] .dateTime {
   margin-top: 3px;
 }
 
-@media (-moz-windows-compositor) {
+@media (-moz-windows-compositor) and (-moz-os-version: windows-win7) {
   #downloadManager {
     -moz-appearance: -moz-win-glass;
     background: transparent;