diff --git a/im/themes/richlistbox.css b/im/themes/richlistbox.css
index 2885f04eb7..15970e0066 100644
--- a/im/themes/richlistbox.css
+++ b/im/themes/richlistbox.css
@@ -20,17 +20,15 @@ richlistitem {
 %endif
 }
 
-%ifdef XP_WIN
-richlistitem[selected="true"] {
-  background-image: url(chrome://mozapps/skin/extensions/itemEnabledFader.png);
-}
-%else
+%ifdef XP_UNIX
+%ifdef XP_MACOSX
 richlistitem:not([selected="true"]):nth-child(odd) {
   background-color: -moz-oddtreerow;
 }
-%endif
-
-richlistitem[selected="true"]:not(:-moz-window-inactive) {
-  background-color: Highlight;
-  color: HighlightText;
+%else
+richlistitem[selected="true"]:-moz-window-inactive {
+  background-color: -moz-Dialog;
+  color: -moz-DialogText;
 }
+%endif
+%endif
diff --git a/mail/components/im/themes/imRichlistbox.css b/mail/components/im/themes/imRichlistbox.css
index cd2c5daa9f..15970e0066 100644
--- a/mail/components/im/themes/imRichlistbox.css
+++ b/mail/components/im/themes/imRichlistbox.css
@@ -20,29 +20,13 @@ richlistitem {
 %endif
 }
 
+%ifdef XP_UNIX
 %ifdef XP_MACOSX
 richlistitem:not([selected="true"]):nth-child(odd) {
   background-color: -moz-oddtreerow;
 }
-%endif
-
-%ifdef XP_WIN
-richlistitem[selected="true"] {
-  background-image: url(chrome://mozapps/skin/extensions/itemEnabledFader.png);
-}
-
-richlistitem[selected="true"]:not(:-moz-window-inactive) {
-  background-color: Highlight;
-  color: HighlightText;
-}
 %else
-%ifdef XP_MACOSX
-richlistitem[selected="true"]:not(:-moz-window-inactive) {
-  background-color: Highlight;
-  color: HighlightText;
-}
-%else
-richlistitem[selected="true"] {
+richlistitem[selected="true"]:-moz-window-inactive {
   background-color: -moz-Dialog;
   color: -moz-DialogText;
 }