diff -r 000000000000 -r 6474c204b198 toolkit/content/tests/browser/browser_bug594509.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/content/tests/browser/browser_bug594509.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+function check_about_rights(tab) {
+  let doc = gBrowser.getBrowserForTab(tab).contentDocument;
+  ok(doc.getElementById("your-rights"), "about:rights content loaded");
+  gBrowser.removeTab(tab);
+  finish();
+}
+
+function test() {
+  waitForExplicitFinish();
+  let tab = gBrowser.selectedTab = gBrowser.addTab("about:blank");
+  let browser = gBrowser.getBrowserForTab(tab);
+  browser.addEventListener("load", function() {
+      browser.removeEventListener("load", arguments.callee, true);
+
+      ok(true, "about:rights loaded");
+      executeSoon(function() { check_about_rights(tab); });
+    }, true);
+  browser.loadURI("about:rights", null, null);
+}