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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test no duplicate logins using autofill/autocomplete with related realms</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" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+Login Manager test: no duplicate logins when using autofill and autocomplete with related realms
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Login Manager: related realms autofill/autocomplete. **/
+
+function restoreForm(form) {
+  form.uname.value = "";
+  form.pword.value = "";
+  form.uname.focus();
+}
+
+function sendFakeAutocompleteEvent(element) {
+  const acEvent = document.createEvent("HTMLEvents");
+  acEvent.initEvent("DOMAutoComplete", true, false);
+  element.dispatchEvent(acEvent);
+}
+
+function spinEventLoop() {
+  return Promise.resolve();
+}
+
+async function promiseACPopupClosed() {
+  return SimpleTest.promiseWaitForCondition(async () => {
+    const popupState = await getPopupState();
+    return !popupState.open;
+  }, "Wait for AC popup to be closed");
+}
+
+add_setup(async () => {
+  await addLoginsInParent(
+    // Simple related domain relationship where example.com and other-example.com are in the related domains list
+    ["https://other-example.com", "https://other-example.com", null, "relatedUser1", "relatedPass1", "uname", "pword"],
+
+    // Example.com and example.co.uk are related, so sub.example.co.uk should appear on example.com's autocomplete dropdown
+    // The intent is to cover the ebay.com/ebay.co.uk and all other country TLD cases
+    // where the sign in page is actually signin.ebay.com/signin.ebay.co.uk but credentials could have manually been entered
+    // for ebay.com/ebay.co.uk or automatically stored as signin.ebay.com/sigin.ebay.co.uk
+    ["https://sub.example.co.uk", "https://sub.example.co.uk", null, "subUser1", "subPass1", "uname", "pword"],
+
+    // Ensures there are no duplicates for the exact domain that the user is on
+    ["https://example.com", "https://example.com", null, "exactUser1", "exactPass1", "uname", "pword"],
+    ["https://www.example.com", "https://www.example.com", null, "exactWWWUser1", "exactWWWPass1", "uname", "pword"],
+  );
+  listenForUnexpectedPopupShown();
+});
+
+add_task(async function test_no_duplicates_autocomplete_autofill() {
+  const form = createLoginForm({
+    action: "https://www.example.com"
+  });
+
+  await promiseFormsProcessedInSameProcess();
+  await SimpleTest.promiseFocus(window);
+  const results = await popupBy(() => {
+    checkLoginForm(form.uname, "exactUser1", form.pword, "exactPass1")
+    restoreForm(form);
+  });
+
+  const popupState = await getPopupState();
+  is(popupState.selectedIndex, -1, "Check no entires are selected upon opening");
+  const expectedMenuItems = ["exactUser1", "exactWWWUser1", "relatedUser1", "subUser1"];
+  checkAutoCompleteResults(results, expectedMenuItems, window.location.host, "Check all menuitems are displayed correctly");
+
+  const acEvents = await getTelemetryEvents({ process: "parent", filterProps: TelemetryFilterPropsAC, clear: true });
+  is(acEvents.length, 1, "One autocomplete event");
+  checkACTelemetryEvent(acEvents[0], form.uname, {
+    "hadPrevious": "0",
+    "login": expectedMenuItems.length + "",
+    "loginsFooter": "1"
+  });
+  restoreForm(form);
+  synthesizeKey("KEY_Escape");
+});
+</script>
+</pre>
+</body>
+</html>