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diff --git a/dom/tests/mochitest/sessionstorage/test_sessionStorageClone_alwaysPartitioned_exempted.html b/dom/tests/mochitest/sessionstorage/test_sessionStorageClone_alwaysPartitioned_exempted.html
new file mode 100644
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+++ b/dom/tests/mochitest/sessionstorage/test_sessionStorageClone_alwaysPartitioned_exempted.html
@@ -0,0 +1,110 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>sessionStorage clone equal origins</title>
+
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script type="text/javascript" src="interOriginTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+<script type="text/javascript">
+
+var currentTest = 1;
+var currentStep = 1;
+
+async function doNextTest()
+{
+  // Bug 1746646: Make mochitests work with TCP enabled (cookieBehavior = 5)
+  // Acquire storage access permission here so that the sessionStorage object is
+  // shared between this window and the slave in xorigin tests. Without this,
+  // our storage would be isolated as a xorigin iframe.
+  if (isXOrigin) {
+    SpecialPowers.wrap(document).notifyUserGestureActivation();
+    await SpecialPowers.addPermission(
+      "storageAccessAPI",
+      true,
+      window.location.href
+     );
+    await SpecialPowers.wrap(document).requestStorageAccess();
+  }
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["privacy.partition.always_partition_third_party_non_cookie_storage", true],
+      ["privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", true]
+    ],
+  });
+
+  // We must perform the first step of the test
+  // to prepare the land.
+  currentStep = 1;
+  doStep();
+
+  let hash = "#";
+  if (isXOrigin) hash += "xorigin";
+
+  switch (currentTest)
+  {
+    case 1:
+      // Open a window from the same origin and check data
+      // are copied but not further modified on our side
+      slaveOrigin = "http://mochi.test:8888";
+      slave = window.open(slaveOrigin + slavePath + "frameEqual.html" + hash);
+      break;
+
+    case 2:
+      slave.close();
+      // Open a window from a different origin and check data
+      // are NOT copied and not modified on our side
+      slaveOrigin = "https://example.com";
+      slave = window.open(slaveOrigin + slavePath + "frameNotEqual.html" + hash);
+      break;
+
+    case 3:
+      slave.close();
+      sessionStorage.clear();
+      SimpleTest.finish();
+      break;
+  }
+
+  ++currentTest;
+}
+
+function doStep()
+{
+  switch (currentStep)
+  {
+    case 1:
+      sessionStorage.setItem("A", "1");
+      sessionStorage.setItem("B", "2");
+      is(sessionStorage.getItem("A"), "1", "A is 1 in the master");
+      is(sessionStorage.getItem("B"), "2", "B is 2 in the master");
+      is(sessionStorage.length, 2, "Num of items is 2");
+      break;
+
+    case 3:
+      is(sessionStorage.getItem("A"), "1", "A is 1 in the master");
+      is(sessionStorage.getItem("B"), "2", "B is 2 in the master");
+      is(sessionStorage.getItem("C"), null, "C is null in the master");
+      is(sessionStorage.length, 2, "Num of items is 2");
+
+      sessionStorage.setItem("C", "4");
+      is(sessionStorage.getItem("C"), "4", "C is 4 in the master");
+      is(sessionStorage.length, 3, "Num of items is 3");
+      break;
+  }
+
+  ++currentStep;
+  ++currentStep;
+
+  return true;
+}
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+
+</head>
+
+<body onload="doNextTest();">
+</body>
+</html>