diff --git a/themes/modern/global/tree.css b/themes/modern/global/tree.css
index d96bf43a525..695a7049e6f 100644
--- a/themes/modern/global/tree.css
+++ b/themes/modern/global/tree.css
@@ -73,10 +73,17 @@ treechildren::-moz-tree-row {
   height: 1.3em;
 }
 
+/* ::::: alternating background ::::: */
+treechildren[alternatingbackground="true"]::-moz-tree-row(odd) {
+  background-color: #f3f3f3;
+}
+
+treechildren[alternatingbackground="true"]::-moz-tree-row(odd, selected),
 treechildren::-moz-tree-row(selected) {
   background-color: #C7D0D9;
 }
 
+treechildren[alternatingbackground="true"]::-moz-tree-row(odd, selected, focus),
 treechildren::-moz-tree-row(selected, focus) {
   background-color: #424F63;
 }
@@ -304,25 +311,3 @@ treechildren.gridlines::-moz-tree-cell {
 treechildren.gridlines::-moz-tree-row {
   border: none;
 }
-
-/* ::::: alternating background ::::: */
-
-treechildren[alternatingbackground="true"]::-moz-tree-row(odd) {
-  background-color: #f3f3f3;
-}
-
-treechildren[alternatingbackground="true"]::-moz-tree-row(odd, selected) {
-  background-color: -moz-Dialog;
-}
-
-treechildren[alternatingbackground="true"]::-moz-tree-cell-text(odd, selected) {
-  color: -moz-DialogText;
-}
-
-treechildren[alternatingbackground="true"]::-moz-tree-row(odd, selected, focus) {
-  background-color: Highlight;
-}
-
-treechildren[alternatingbackground="true"]::-moz-tree-cell-text(odd, selected, focus) {
-  color: HighlightText;
-}