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diff --git a/browser/components/sessionstore/test/browser_formdata.js b/browser/components/sessionstore/test/browser_formdata.js
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+++ b/browser/components/sessionstore/test/browser_formdata.js
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+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(2);
+
+/**
+ * This test ensures that form data collection respects the privacy level as
+ * set by the user.
+ */
+add_task(async function test_formdata() {
+  const URL =
+    "http://mochi.test:8888/browser/browser/components/" +
+    "sessionstore/test/browser_formdata_sample.html";
+
+  const OUTER_VALUE = "browser_formdata_" + Math.random();
+  const INNER_VALUE = "browser_formdata_" + Math.random();
+
+  // Creates a tab, loads a page with some form fields,
+  // modifies their values and closes the tab.
+  async function createAndRemoveTab() {
+    // Create a new tab.
+    let tab = BrowserTestUtils.addTab(gBrowser, URL);
+    let browser = tab.linkedBrowser;
+    await promiseBrowserLoaded(browser);
+
+    // Modify form data.
+    await setPropertyOfFormField(browser, "#txt", "value", OUTER_VALUE);
+    await setPropertyOfFormField(
+      browser.browsingContext.children[0],
+      "#txt",
+      "value",
+      INNER_VALUE
+    );
+
+    // Remove the tab.
+    await promiseRemoveTabAndSessionState(tab);
+  }
+
+  await createAndRemoveTab();
+  let [
+    {
+      state: { formdata },
+    },
+  ] = ss.getClosedTabData(window);
+  is(formdata.id.txt, OUTER_VALUE, "outer value is correct");
+  is(formdata.children[0].id.txt, INNER_VALUE, "inner value is correct");
+
+  // Disable saving data for encrypted sites.
+  Services.prefs.setIntPref("browser.sessionstore.privacy_level", 1);
+
+  await createAndRemoveTab();
+  [
+    {
+      state: { formdata },
+    },
+  ] = ss.getClosedTabData(window);
+  is(formdata.id.txt, OUTER_VALUE, "outer value is correct");
+  ok(!formdata.children, "inner value was *not* stored");
+
+  // Disable saving data for any site.
+  Services.prefs.setIntPref("browser.sessionstore.privacy_level", 2);
+
+  await createAndRemoveTab();
+  [
+    {
+      state: { formdata },
+    },
+  ] = ss.getClosedTabData(window);
+  ok(!formdata, "form data has *not* been stored");
+
+  // Restore the default privacy level.
+  Services.prefs.clearUserPref("browser.sessionstore.privacy_level");
+});
+
+/**
+ * This test ensures that a malicious website can't trick us into restoring
+ * form data into a wrong website and that we always check the stored URL
+ * before doing so.
+ */
+add_task(async function test_url_check() {
+  const URL = "data:text/html;charset=utf-8,<input id=input>";
+  const VALUE = "value-" + Math.random();
+
+  // Create a tab with an iframe containing an input field.
+  let tab = BrowserTestUtils.addTab(gBrowser, URL);
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser);
+
+  // Restore a tab state with a given form data url.
+  async function restoreStateWithURL(url) {
+    let state = {
+      entries: [{ url: URL, triggeringPrincipal_base64 }],
+      formdata: { id: { input: VALUE } },
+    };
+
+    if (url) {
+      state.formdata.url = url;
+    }
+
+    await promiseTabState(tab, state);
+    return getPropertyOfFormField(browser, "#input", "value");
+  }
+
+  // Check that the form value is restored with the correct URL.
+  is(await restoreStateWithURL(URL), VALUE, "form data restored");
+
+  // Check that the form value is *not* restored with the wrong URL.
+  is(await restoreStateWithURL(URL + "?"), "", "form data not restored");
+  is(await restoreStateWithURL(), "", "form data not restored");
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+});
+
+/**
+ * This test ensures that collecting form data works as expected when having
+ * nested frame sets.
+ */
+add_task(async function test_nested() {
+  const URL =
+    "data:text/html;charset=utf-8," +
+    "<iframe src='data:text/html;charset=utf-8,<input/>'/>";
+
+  const FORM_DATA = {
+    children: [
+      {
+        url: "data:text/html;charset=utf-8,<input/>",
+        xpath: { "/xhtml:html/xhtml:body/xhtml:input": "m" },
+      },
+    ],
+  };
+
+  // Create a tab with an iframe containing an input field.
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, URL));
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser, false /* don't ignore subframes */);
+
+  const iframe = await SpecialPowers.spawn(browser, [], () => {
+    return content.document.querySelector("iframe").browsingContext;
+  });
+  await SpecialPowers.spawn(iframe, [], async () => {
+    const input = content.document.querySelector("input");
+    const focusPromise = new Promise(resolve => {
+      input.addEventListener("focus", resolve, { once: true });
+    });
+    input.focus();
+    await focusPromise;
+  });
+
+  // Modify the input field's value.
+  await BrowserTestUtils.synthesizeKey("m", {}, browser);
+
+  // Remove the tab and check that we stored form data correctly.
+  await promiseRemoveTabAndSessionState(tab);
+  let [
+    {
+      state: { formdata },
+    },
+  ] = ss.getClosedTabData(window);
+  is(
+    JSON.stringify(formdata),
+    JSON.stringify(FORM_DATA),
+    "formdata for iframe stored correctly"
+  );
+
+  // Restore the closed tab.
+  tab = ss.undoCloseTab(window, 0);
+  browser = tab.linkedBrowser;
+  await promiseTabRestored(tab);
+
+  // Check that the input field has the right value.
+  await TabStateFlusher.flush(browser);
+  ({ formdata } = JSON.parse(ss.getTabState(tab)));
+  is(
+    JSON.stringify(formdata),
+    JSON.stringify(FORM_DATA),
+    "formdata for iframe restored correctly"
+  );
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+});
+
+/**
+ * This test ensures that collecting form data for documents with
+ * designMode=on works as expected.
+ */
+add_task(async function test_design_mode() {
+  const URL =
+    "data:text/html;charset=utf-8,<h1>mozilla</h1>" +
+    "<script>document.designMode='on'</script>";
+
+  // Load a tab with an editable document.
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, URL));
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser);
+
+  // Modify the document content.
+  await BrowserTestUtils.synthesizeKey("m", {}, browser);
+
+  // Close and restore the tab.
+  await promiseRemoveTabAndSessionState(tab);
+  tab = ss.undoCloseTab(window, 0);
+  browser = tab.linkedBrowser;
+  await promiseTabRestored(tab);
+
+  // Check that the innerHTML value was restored.
+  let html = await getPropertyOfFormField(browser, "body", "innerHTML");
+  let expected = "<h1>mmozilla</h1><script>document.designMode='on'</script>";
+  is(html, expected, "editable document has been restored correctly");
+
+  // Close and restore the tab.
+  await promiseRemoveTabAndSessionState(tab);
+  tab = ss.undoCloseTab(window, 0);
+  browser = tab.linkedBrowser;
+  await promiseTabRestored(tab);
+
+  // Check that the innerHTML value was restored.
+  html = await getPropertyOfFormField(browser, "body", "innerHTML");
+  expected = "<h1>mmozilla</h1><script>document.designMode='on'</script>";
+  is(html, expected, "editable document has been restored correctly");
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+});