diff -r 000000000000 -r 6474c204b198 browser/devtools/profiler/test/browser_profiler_run.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/profiler/test/browser_profiler_run.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,119 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL = "data:text/html;charset=utf8,<p>JavaScript Profiler test</p>";
+
+let gTab, gPanel;
+
+function test() {
+  waitForExplicitFinish();
+
+  setUp(URL, function onSetUp(tab, browser, panel) {
+    gTab = tab;
+    gPanel = panel;
+
+    function done() {
+      tearDown(gTab, () => { gPanel = null; gTab = null; });
+    }
+
+    startRecording()
+      .then(stopRecording)
+      .then(startRecordingAgain)
+      .then(stopRecording)
+      .then(switchBackToTheFirstOne)
+      .then(done);
+  });
+}
+
+function startRecording() {
+  let deferred = promise.defer();
+
+  ok(gPanel, "Profiler panel exists");
+  ok(!gPanel.activeProfile, "Active profile doesn't exist");
+  ok(!gPanel.recordingProfile, "Recording profile doesn't exist");
+
+  let record = gPanel.controls.record;
+  ok(record, "Record button exists.");
+  ok(!record.getAttribute("checked"), "Record button is unchecked");
+
+  gPanel.once("started", () => {
+    let item = gPanel.sidebar.getItemByProfile(gPanel.recordingProfile);
+    is(item.attachment.name, "Profile 1");
+    is(item.attachment.state, PROFILE_RUNNING);
+    is(record.getAttribute("tooltiptext"), "Stop profiling");
+
+    gPanel.controller.isActive(function (err, isActive) {
+      ok(isActive, "Profiler is running");
+      deferred.resolve();
+    });
+  });
+
+  record.click();
+  return deferred.promise;
+}
+
+function stopRecording() {
+  let deferred = promise.defer();
+  let record = gPanel.controls.record;
+
+  gPanel.once("parsed", () => {
+    let item = gPanel.sidebar.getItemByProfile(gPanel.activeProfile);
+    is(item.attachment.state, PROFILE_COMPLETED);
+    is(record.getAttribute("tooltiptext"), "Start profiling");
+
+    function assertSample() {
+      let [ win, doc ] = getProfileInternals();
+      let sample = doc.getElementsByClassName("samplePercentage");
+
+      if (sample.length <= 0) {
+        return void setTimeout(assertSample, 100);
+      }
+
+      ok(sample.length > 0, "We have some items displayed");
+      is(sample[0].innerHTML, "100.0%", "First percentage is 100%");
+
+      deferred.resolve();
+    }
+
+    assertSample();
+  });
+
+  setTimeout(function () gPanel.controls.record.click(), 100);
+  return deferred.promise;
+}
+
+function startRecordingAgain() {
+  let deferred = promise.defer();
+
+  let record = gPanel.controls.record;
+  ok(!record.getAttribute("checked"), "Record button is unchecked");
+
+  gPanel.once("started", () => {
+    ok(gPanel.activeProfile !== gPanel.recordingProfile);
+
+    let item = gPanel.sidebar.getItemByProfile(gPanel.recordingProfile);
+    is(item.attachment.name, "Profile 2");
+    is(item.attachment.state, PROFILE_RUNNING);
+    is(record.getAttribute("tooltiptext"), "Stop profiling");
+
+    deferred.resolve();
+  });
+
+  record.click();
+  return deferred.promise;
+}
+
+function switchBackToTheFirstOne() {
+  let deferred = promise.defer();
+  let button = gPanel.sidebar.getElementByProfile({ uid: 1 });
+  let item = gPanel.sidebar.getItemByProfile({ uid: 1 });
+
+  gPanel.once("profileSwitched", () => {
+    is(gPanel.activeProfile.uid, 1, "activeProfile is correct");
+    is(gPanel.sidebar.selectedItem, item, "selectedItem is correct");
+    deferred.resolve();
+  });
+
+  button.click();
+  return deferred.promise;
+}