diff -r 000000000000 -r 6474c204b198 browser/themes/osx/downloads/contentAreaDownloadsView.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/osx/downloads/contentAreaDownloadsView.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* 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/. */
+
+@import url("chrome://global/skin/inContentUI.css");
+
+.downloadButton {
+  box-shadow: none;
+}
+
+.downloadButton:not([disabled="true"]):hover:active,
+.downloadButton:not([disabled]):hover:active {
+  background: transparent;
+  border: none;
+  box-shadow: none;
+}
+
+#downloadsListEmptyDescription {
+  margin: 1em;
+  text-align: center;
+  color: GrayText;
+}