diff --git a/mozilla/suite/themes/modern/global/listbox.css b/mozilla/suite/themes/modern/global/listbox.css
index 17dfe82a7b7..49318fb802e 100644
--- a/mozilla/suite/themes/modern/global/listbox.css
+++ b/mozilla/suite/themes/modern/global/listbox.css
@@ -56,6 +56,10 @@ listbox {
   color: #000000;
 }
 
+listbox[disabled="true"] {
+  color: #999999;
+}
+
 /* ::::: listitem ::::: */
 
 listitem {