-.tabmail-tab[type="folder"][SpecialFolder="Outbox"],
-.tabmail-tab[type="folder"][SpecialFolder="Unsent Messages"],
-treechildren::-moz-tree-image(folderNameCol, specialFolder-Outbox),
-treechildren::-moz-tree-image(folderNameCol, specialFolder-Unsent Messages) {
+.icon-holder[type="folder"][SpecialFolder="Outbox"],
+treechildren::-moz-tree-image(folderNameCol, specialFolder-Outbox) {