diff -r 000000000000 -r 6474c204b198 browser/devtools/profiler/test/browser_profiler_gecko_data.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/profiler/test/browser_profiler_gecko_data.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* 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; });
+    }
+
+    Services.prefs.setBoolPref(SHOW_PLATFORM_DATA, false);
+    recordProfile()
+      .then(toggleGeckoDataOption)
+      .then(recordProfile)
+      .then(done);
+  });
+}
+
+function recordProfile() {
+  let deferred = promise.defer();
+  let record = gPanel.controls.record;
+
+  gPanel.once("started", () => {
+    gPanel.once("parsed", () => {
+      // We cannot be sure which data is returned by
+      // the profiler within a test. Until we get rid
+      // of Cleopatra, at least.
+      deferred.resolve();
+    });
+
+    record.click();
+  });
+
+  record.click();
+  return deferred.promise;
+}
+
+function toggleGeckoDataOption() {
+  ok(!gPanel.showPlatformData, "showPlatformData is not set");
+
+  Services.prefs.setBoolPref(SHOW_PLATFORM_DATA, true);
+
+  ok(gPanel.showPlatformData, "showPlatformData is set");
+}