diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_cached_messages.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_cached_messages.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+// Test to see if the cached messages are displayed when the console UI is opened.
+
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-webconsole-error-observer.html";
+
+function test()
+{
+  waitForExplicitFinish();
+
+  expectUncaughtException();
+
+  addTab(TEST_URI);
+  gBrowser.selectedBrowser.addEventListener("load", function onLoad() {
+    gBrowser.selectedBrowser.removeEventListener("load", onLoad, true);
+    testOpenUI(true);
+  }, true);
+}
+
+function testOpenUI(aTestReopen)
+{
+  openConsole(null, function(hud) {
+    waitForMessages({
+      webconsole: hud,
+      messages: [
+        {
+          text: "log Bazzle",
+          category: CATEGORY_WEBDEV,
+          severity: SEVERITY_LOG,
+        },
+        {
+          text: "error Bazzle",
+          category: CATEGORY_WEBDEV,
+          severity: SEVERITY_ERROR,
+        },
+        {
+          text: "bazBug611032",
+          category: CATEGORY_JS,
+          severity: SEVERITY_ERROR,
+        },
+        {
+          text: "cssColorBug611032",
+          category: CATEGORY_CSS,
+          severity: SEVERITY_WARNING,
+        },
+      ],
+    }).then(() => {
+      closeConsole(gBrowser.selectedTab, function() {
+        aTestReopen && info("will reopen the Web Console");
+        executeSoon(aTestReopen ? testOpenUI : finishTest);
+      });
+    });
+  });
+}