diff -r 000000000000 -r 6474c204b198 browser/devtools/profiler/test/browser_profiler_io.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/profiler/test/browser_profiler_io.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL = "data:text/html;charset=utf8,<p>browser_profiler_io</p>";
+
+let temp = {};
+Cu.import("resource://gre/modules/FileUtils.jsm", temp);
+let FileUtils = temp.FileUtils;
+let gTab, gPanel;
+
+let gData = {
+  "libs": "[]", // This property is not important for this test.
+  "meta": {
+    "version": 2,
+    "interval": 1,
+    "stackwalk": 0,
+    "jank": 0,
+    "processType": 0,
+    "platform": "Macintosh",
+    "oscpu": "Intel Mac OS X 10.8",
+    "misc": "rv:25.0",
+    "abi": "x86_64-gcc3",
+    "toolkit": "cocoa",
+    "product": "Firefox"
+  },
+  "threads": [
+    {
+      "samples": [
+        {
+          "name": "(root)",
+          "frames": [
+            {
+              "location": "Startup::XRE_Main",
+              "line": 3871
+            },
+            {
+              "location": "Events::ProcessGeckoEvents",
+              "line": 355
+            },
+            {
+              "location": "Events::ProcessGeckoEvents",
+              "line": 355
+            }
+          ],
+          "responsiveness": -0.002963,
+          "time": 8.120823
+        }
+      ]
+    }
+  ]
+};
+
+function test() {
+  waitForExplicitFinish();
+
+  setUp(URL, function onSetUp(tab, browser, panel) {
+    gTab = tab;
+    gPanel = panel;
+
+    let file = FileUtils.getFile("TmpD", ["tmpprofile.json"]);
+    file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("666", 8));
+
+    gPanel.saveProfile(file, gData)
+      .then(gPanel.loadProfile.bind(gPanel, file))
+      .then(checkData);
+  });
+}
+
+function checkData() {
+  let profile = gPanel.activeProfile;
+  let item = gPanel.sidebar.getItemByProfile(profile);
+  let data = profile.data;
+
+  is(item.attachment.state, PROFILE_COMPLETED, "Profile is COMPLETED");
+  is(gData.meta.oscpu, data.meta.oscpu, "Meta data is correct");
+  is(gData.threads[0].samples.length, 1, "There's one sample");
+  is(gData.threads[0].samples[0].name, "(root)", "Sample is correct");
+
+  tearDown(gTab, () => { gPanel = null; gTab = null; });
+}
\ No newline at end of file