diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/global/media/TopLevelVideoDocument.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/global/media/TopLevelVideoDocument.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+/* 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/. */
+
+body {
+  background-image: url("chrome://global/skin/media/imagedoc-darknoise.png");
+}
+
+video {
+  box-shadow: 0 0 15px #000;
+}