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+++ b/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_sandboxed.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test form field autocomplete in sandboxed documents (null principal)</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="text/javascript" src="../../../satchel/test/satchel_common.js"></script>
+  <script type="text/javascript" src="pwmgr_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+
+<!-- we presumably can't hide the content for this test. -->
+<div id="content">
+  <iframe id="sandboxed"
+          sandbox=""
+          src="form_basic.html"></iframe>
+</div>
+
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Login Manager: form field autocomplete in sandboxed documents (null principal) **/
+
+let sandboxed = document.getElementById("sandboxed");
+let uname;
+let pword;
+let hostname;
+
+add_setup(async () => {
+  await setStoredLoginsAsync(
+    [window.location.origin, "", null, "tempuser1", "temppass1", "uname", "pword"]
+  );
+  let frameWindow = SpecialPowers.wrap(sandboxed).contentWindow;
+  // Can't use SimpleTest.promiseFocus as it doesn't work with the sandbox.
+  await SimpleTest.promiseWaitForCondition(() => {
+    return frameWindow.document.readyState == "complete" && frameWindow.location.href != "about:blank";
+  }, "Check frame is loaded");
+  let frameDoc = SpecialPowers.wrap(sandboxed).contentDocument;
+  uname = frameDoc.getElementById("form-basic-username");
+  pword = frameDoc.getElementById("form-basic-password");
+  hostname = frameDoc.documentURIObject.host;
+});
+
+add_task(async function test_no_autofill() {
+  // Make sure initial form is empty as autofill shouldn't happen in the sandboxed frame.
+  checkLoginForm(uname, "", pword, "");
+  let popupState = await getPopupState();
+  is(popupState.open, false, "Check popup is initially closed");
+});
+
+add_task(async function test_autocomplete_warning_no_logins() {
+  const { items } = await openPopupOn(pword);
+
+  let popupState = await getPopupState();
+  is(popupState.selectedIndex, -1, "Check no entries are selected upon opening");
+
+  let expectedMenuItems = [
+    "This connection is not secure. Logins entered here could be compromised. Learn More",
+  ];
+  checkAutoCompleteResults(items, expectedMenuItems, hostname, "Check all menuitems are displayed correctly.");
+
+  checkLoginForm(uname, "", pword, "");
+});
+</script>
+</pre>
+</body>
+</html>