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diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_concurrent.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_concurrent.js
new file mode 100644
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--- /dev/null
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_concurrent.js
@@ -0,0 +1,101 @@
+/* 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/. */
+
+// Test opening two tabs that share a localStorage, but keep one in private mode.
+// Ensure that values from one don't leak into the other, and that values from
+// earlier private storage sessions aren't visible later.
+
+// Step 1: create new tab, load a page that sets test=value in non-private storage
+// Step 2: create a new tab, load a page that sets test2=value2 in private storage
+// Step 3: load a page in the tab from step 1 that checks the value of test2 is value2 and the total count in non-private storage is 1
+// Step 4: load a page in the tab from step 2 that checks the value of test is value and the total count in private storage is 1
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount", 1]],
+  });
+});
+
+add_task(async function test() {
+  let prefix =
+    "http://mochi.test:8888/browser/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_concurrent_page.html";
+
+  function getElts(browser) {
+    return browser.contentTitle.split("|");
+  }
+
+  // Step 1
+  let non_private_browser = gBrowser.selectedBrowser;
+  let url = prefix + "?action=set&name=test&value=value&initial=true";
+  BrowserTestUtils.loadURIString(non_private_browser, url);
+  await BrowserTestUtils.browserLoaded(non_private_browser, false, url);
+
+  // Step 2
+  let private_window = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  let private_browser = private_window.gBrowser.selectedBrowser;
+  url = prefix + "?action=set&name=test2&value=value2";
+  BrowserTestUtils.loadURIString(private_browser, url);
+  await BrowserTestUtils.browserLoaded(private_browser, false, url);
+
+  // Step 3
+  url = prefix + "?action=get&name=test2";
+  BrowserTestUtils.loadURIString(non_private_browser, url);
+  await BrowserTestUtils.browserLoaded(non_private_browser, false, url);
+  let elts = await getElts(non_private_browser);
+  isnot(elts[0], "value2", "public window shouldn't see private storage");
+  is(elts[1], "1", "public window should only see public items");
+
+  // Step 4
+  url = prefix + "?action=get&name=test";
+  BrowserTestUtils.loadURIString(private_browser, url);
+  await BrowserTestUtils.browserLoaded(private_browser, false, url);
+  elts = await getElts(private_browser);
+  isnot(elts[0], "value", "private window shouldn't see public storage");
+  is(elts[1], "1", "private window should only see private items");
+
+  // Reopen the private window again, without privateBrowsing, which should clear the
+  // the private storage.
+  private_window.close();
+  private_window = await BrowserTestUtils.openNewBrowserWindow({
+    private: false,
+  });
+  private_browser = null;
+  await new Promise(resolve => Cu.schedulePreciseGC(resolve));
+  private_browser = private_window.gBrowser.selectedBrowser;
+
+  url = prefix + "?action=get&name=test2";
+  BrowserTestUtils.loadURIString(private_browser, url);
+  await BrowserTestUtils.browserLoaded(private_browser, false, url);
+  elts = await getElts(private_browser);
+  isnot(
+    elts[0],
+    "value2",
+    "public window shouldn't see cleared private storage"
+  );
+  is(elts[1], "1", "public window should only see public items");
+
+  // Making it private again should clear the storage and it shouldn't
+  // be able to see the old private storage as well.
+  private_window.close();
+  private_window = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  private_browser = null;
+  await new Promise(resolve => Cu.schedulePreciseGC(resolve));
+  private_browser = private_window.gBrowser.selectedBrowser;
+
+  url = prefix + "?action=set&name=test3&value=value3";
+  BrowserTestUtils.loadURIString(private_browser, url);
+  await BrowserTestUtils.browserLoaded(private_browser, false, url);
+  elts = await getElts(private_browser);
+  is(elts[1], "1", "private window should only see new private items");
+
+  // Cleanup.
+  url = prefix + "?final=true";
+  BrowserTestUtils.loadURIString(non_private_browser, url);
+  await BrowserTestUtils.browserLoaded(non_private_browser, false, url);
+  private_window.close();
+});