diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug633691.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug633691.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function test() {
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+  // Open a html page with about:certerror in an iframe
+  window.content.addEventListener("load", testIframeCert, true);
+  content.location = "data:text/html,<iframe width='700' height='700' src='about:certerror'></iframe>";
+}
+
+function testIframeCert() {
+  window.content.removeEventListener("load", testIframeCert, true);
+  // Confirm that the expert section is hidden
+  var doc = gBrowser.contentDocument.getElementsByTagName('iframe')[0].contentDocument;
+  var eC = doc.getElementById("expertContent");
+  ok(eC, "Expert content should exist")
+  ok(eC.hasAttribute("hidden"), "Expert content should be hidded by default");
+
+  // Clean up
+  gBrowser.removeCurrentTab();
+  
+  finish();
+}