diff -r 000000000000 -r 6474c204b198 browser/components/preferences/tests/browser_bug410900.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/preferences/tests/browser_bug410900.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+function test() {
+  waitForExplicitFinish();
+
+  // Setup a phony handler to ensure the app pane will be populated.
+  var handler = Cc["@mozilla.org/uriloader/web-handler-app;1"].
+                createInstance(Ci.nsIWebHandlerApp);
+  handler.name = "App pane alive test";
+  handler.uriTemplate = "http://test.mozilla.org/%s";
+
+  var extps = Cc["@mozilla.org/uriloader/external-protocol-service;1"].
+              getService(Ci.nsIExternalProtocolService);
+  var info = extps.getProtocolHandlerInfo("apppanetest");
+  info.possibleApplicationHandlers.appendElement(handler, false);
+
+  var hserv = Cc["@mozilla.org/uriloader/handler-service;1"].
+              getService(Ci.nsIHandlerService);
+  hserv.store(info);
+
+  function observer(win, topic, data) {
+    if (topic != "app-handler-pane-loaded")
+      return;
+
+    Services.obs.removeObserver(observer, "app-handler-pane-loaded");
+    runTest(win);
+  }
+  Services.obs.addObserver(observer, "app-handler-pane-loaded", false);
+
+  openDialog("chrome://browser/content/preferences/preferences.xul", "Preferences",
+             "chrome,titlebar,toolbar,centerscreen,dialog=no", "paneApplications");
+}
+
+function runTest(win) {
+  var sel = win.document.documentElement.getAttribute("lastSelected");
+  ok(sel == "paneApplications", "Specified pane was opened");
+
+  var rbox = win.document.getElementById("handlersView");
+  ok(rbox, "handlersView is present");
+
+  var items = rbox && rbox.getElementsByTagName("richlistitem");
+  ok(items && items.length > 0, "App handler list populated");
+
+  var handlerAdded = false;
+  for (let i = 0; i < items.length; i++) {
+    if (items[i].type == "apppanetest")
+      handlerAdded = true;
+  }
+  ok(handlerAdded, "apppanetest protocol handler was successfully added");
+
+  win.close();
+  finish();
+}