diff -r 000000000000 -r 6474c204b198 browser/themes/shared/devtools/scratchpad.inc.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/shared/devtools/scratchpad.inc.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+%if 0
+/* 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/. */
+%endif
+
+#scratchpad-sidebar > tabs {
+  height: 0;
+  border: none;
+}
+
+#sp-toolbar {
+  border: none;
+}