diff -r 000000000000 -r 6474c204b198 browser/base/content/aboutcerterror/aboutCertError.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/aboutcerterror/aboutCertError.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+/* 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/. */
+
+/* Logical CSS rules belong here, but presentation & theming rules
+   should live in the CSS of the appropriate theme */
+
+#technicalContentText {
+  overflow: auto;
+  white-space: pre-wrap;
+}
+
+.expander[hidden],
+.expander[hidden] + *,
+.expander[collapsed] + * {
+  display: none;
+}