diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_start_netmon_first.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_start_netmon_first.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* 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/. */
+
+// Check that the webconsole works if the network monitor is first opened, then
+// the user switches to the webconsole. See bug 970914.
+
+function test() {
+  Task.spawn(runner).then(finishTest);
+
+  function* runner() {
+    const {tab} = yield loadTab("data:text/html;charset=utf8,<p>hello");
+
+    const target = TargetFactory.forTab(tab);
+    const toolbox = yield gDevTools.showToolbox(target, "netmonitor");
+
+    const hud = yield openConsole(tab);
+
+    hud.jsterm.execute("console.log('foobar bug970914')");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        name: "console.log",
+        text: "foobar bug970914",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+      }],
+    });
+
+    let text = hud.outputNode.textContent;
+    isnot(text.indexOf("foobar bug970914"), -1, "console.log message confirmed");
+    ok(!/logging API|disabled by a script/i.test(text),
+       "no warning about disabled console API");
+  }
+}
+