diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/global/linkTree.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/global/linkTree.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+/** 
+ * All the properties in this rule are important to avoid having to create 
+ * a special type of tree. This stylesheet can be loaded into a document with
+ * a single tree that is a link tree. Hardly elegant but it's efficient.
+ */  
+treeitem[selected="true"] > treerow
+  {
+    background            : transparent !important;
+    border                : none !important;
+    color                 : -moz-FieldText !important;
+  }
+  
+treecell:hover
+  {
+    text-decoration       : underline !important;
+    color                 : #000080 !important;
+    cursor                : pointer;
+  }
+  
+treecell:hover:active
+  {
+    text-decoration       : underline !important;
+    color                 : red !important;
+  } 
+  
+