diff --git a/themes/modern/messenger/folderPane.css b/themes/modern/messenger/folderPane.css
index 6ea404ed0c7..f55e31ed0df 100644
--- a/themes/modern/messenger/folderPane.css
+++ b/themes/modern/messenger/folderPane.css
@@ -31,6 +31,7 @@
 
 .folderTreeItem {
   list-style-image: url("chrome://messenger/skin/icons/folder-closed.gif");
+  font-weight: normal;
 }
 
 .folderTreeItem[selected="true"]