--- a/mail/themes/qute/mail/tabmail-aero.css
+++ b/mail/themes/qute/mail/tabmail-aero.css
@@ -173,20 +173,16 @@
 .tabmail-tab[selected="true"] {
   font-weight: bold;
 }
 
 .tabmail-tab[selected="true"] > .tab-image-middle > .tab-text {
   opacity: 1.0 !important;
 }
 
-.tabmail-tab:-moz-lwtheme[selected="true"] {
-  text-shadow: none;
-}
-
 @media all and (-moz-windows-compositor) {
   .tabmail-tabs:not(:-moz-lwtheme) {
     background: transparent;
   }
 }
 
 .tab-icon-image {
   -moz-margin-start: 2px;