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diff --git a/docshell/test/mochitest/test_bug1121701.html b/docshell/test/mochitest/test_bug1121701.html
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+++ b/docshell/test/mochitest/test_bug1121701.html
@@ -0,0 +1,108 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1121701
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1121701</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1121701 */
+  SimpleTest.waitForExplicitFinish();
+
+  var testUrl1 = "file_bug1121701_1.html";
+  var testUrl2 = "file_bug1121701_2.html";
+
+  var page1LoadCount = 0;
+  let page1Done = {};
+  page1Done.promise = new Promise(resolve => {
+    page1Done.resolve = resolve;
+  });
+  let page2Done = {};
+  page2Done.promise = new Promise(resolve => {
+    page2Done.resolve = resolve;
+  });
+
+  addLoadEvent(async function() {
+
+    // Bug 1746646: Make mochitests work with TCP enabled (cookieBehavior = 5)
+    // Acquire storage access permission here so that the BroadcastChannel used to
+    // communicate with the opened windows works in xorigin tests. Otherwise,
+    // the iframe containing this page is isolated from first-party storage access,
+    // which isolates BroadcastChannel communication.
+    if (isXOrigin) {
+      await SpecialPowers.pushPrefEnv({
+        set: [["privacy.partition.always_partition_third_party_non_cookie_storage", false]],
+      });
+      SpecialPowers.wrap(document).notifyUserGestureActivation();
+      await SpecialPowers.addPermission("storageAccessAPI", true, window.location.href);
+      await SpecialPowers.wrap(document).requestStorageAccess();
+    }
+
+    var bc = new BroadcastChannel("file_bug1121701_1");
+    var bc2 = new BroadcastChannel("file_bug1121701_2");
+
+    async function scheduleFinish() {
+      await Promise.all([page1Done.promise, page2Done.promise]);
+      bc2.close();
+      bc.close();
+      SimpleTest.finish();
+    }
+
+    bc.onmessage = (msgEvent) => {
+      var msg = msgEvent.data;
+      var command = msg.command;
+      if (command == "child1PageShow") {
+        ++page1LoadCount;
+        var persisted = msg.persisted;
+        var pageHideAsserts = msg.pageHideAsserts;
+        if (pageHideAsserts) {
+          ok(pageHideAsserts.persisted, "onpagehide: test page 1 should get persisted");
+          is(pageHideAsserts.innerHTML, "modified",  "onpagehide: innerHTML text is 'modified'");
+        }
+        if (page1LoadCount == 1) {
+          SimpleTest.executeSoon(function() {
+            is(persisted, false, "Initial page load shouldn't be persisted.");
+            bc.postMessage({command: "setInnerHTML", testUrl2});
+          });
+        } else if (page1LoadCount == 2) {
+          is(persisted, true, "Page load from bfcache should be persisted.");
+          is(msg.innerHTML, "modified", "innerHTML text is 'modified'");
+          bc.postMessage({command: "close"});
+        }
+      } else if (command == "closed") {
+        page1Done.resolve();
+      }
+    }
+    bc2.onmessage = (msgEvent) => {
+      var msg = msgEvent.data;
+      var command = msg.command;
+      if (command == "child2PageShow") {
+        bc2.postMessage({command: "setInnerHTML", location: location.href});
+      } else if (command == "onmessage") {
+        page2Done.resolve();
+      }
+    }
+
+    scheduleFinish();
+    // If Fission is disabled, the pref is no-op.
+    SpecialPowers.pushPrefEnv({set: [["fission.bfcacheInParent", true]]}, () => {
+      window.open(testUrl1, "", "noopener");
+    });
+  });
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1121701">Mozilla Bug 1121701</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>