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diff --git a/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_basic_form_subdomain.html b/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_basic_form_subdomain.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test that logins with non-exact match origin appear in autocomplete dropdown</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" 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>
+Login Manager test: logins with non-exact match origin appear in autocomplete dropdown
+<p id="display"></p>
+
+<!-- we presumably can't hide the content for this test. -->
+<div id="content"></div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+const setupScript = runInParent(function setup() {
+  addMessageListener("getDateString", () => {
+    const dateAndTimeFormatter = new Services.intl.DateTimeFormat(undefined, { dateStyle: "medium" });
+    return dateAndTimeFormatter.format(new Date());
+  });
+});
+
+add_setup(async () => {
+  const origin = window.location.origin;
+  const lastDot = origin.lastIndexOf(".");
+  const suffix = origin.slice(lastDot);
+
+  const baseHost = "http://example" + suffix;
+  const baseSecureHost = "https://example" + suffix;
+  const oldHost = "http://old.example" + suffix;
+  const oldSecureHost = "https://old.example" + suffix;
+  const newHost = "https://new.example" + suffix;
+
+  await addLoginsInParent(
+    // The first two logins should never be visible on https: versions of
+    // *.example.com since the login is for http: and an https: login exists for this username.
+    [oldHost, oldSecureHost, null, "dsdu1", "dsdp1new", "uname", "pword"],
+    [baseHost, baseSecureHost, null, "dsdu1", "dsdp1", "uname", "pword"],
+    [oldSecureHost, oldSecureHost, null, "dsdu1", "dsdp1", "uname", "pword"],
+    [baseSecureHost, baseSecureHost, null, "dsdu1", "dsdp1", "uname", "pword"],
+    [newHost, newHost, null, "dsdu1", "dsdp1prime", "uname", "pword"]
+  );
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.includeOtherSubdomainsInLookup", true],
+    ],
+  });
+  listenForUnexpectedPopupShown();
+});
+
+add_task(async function test_form1_initial_empty() {
+  const form = createLoginForm({
+    action: "https://otherexample.com/formtest.js"
+  });
+
+  // Make sure initial form is empty.
+  checkLoginForm(form.uname, "", form.pword, "");
+  const popupState = await getPopupState();
+  is(popupState.open, false, "Check popup is initially closed");
+});
+
+/* For this testcase, there exists two logins for this origin
+ * on different subdomains but with different passwords. Both logins
+ * should appear in the autocomplete popup.
+ */
+add_task(async function test_form1_menu_shows_two_logins_same_usernames_for_different_subdomain() {
+  const form = createLoginForm({
+    action: "https://otherexample.com/formtest.js"
+  });
+
+  // Trigger autocomplete popup
+  form.uname.focus();
+
+  const autocompleteItems = await popupByArrowDown();
+
+  const popupState = await getPopupState();
+  is(popupState.selectedIndex, -1, "Check no entries are selected upon opening");
+
+  // The logins are added "today" and since they are duplicates, the date that they were last
+  // changed will be appended.
+  const dateString = await setupScript.sendQuery("getDateString");
+  const username = `dsdu1 (${dateString})`;
+
+  checkAutoCompleteResults(autocompleteItems, [username, username], window.location.host, "Check all menuitems are displayed correctly.");
+
+  synthesizeKey("KEY_ArrowDown"); // first item
+  checkLoginForm(form.uname, "", form.pword, ""); // value shouldn't update just by selecting
+
+  synthesizeKey("KEY_Enter");
+  await promiseFormsProcessedInSameProcess();
+  is(form.pword.value, "dsdp1", "password should match the login that was selected");
+  checkLoginForm(form.uname, "dsdu1", form.pword, "dsdp1");
+
+  form.uname.value = "";
+  form.pword.value = "";
+  form.uname.focus();
+
+  await popupByArrowDown();
+
+  synthesizeKey("KEY_ArrowDown"); // first item
+  synthesizeKey("KEY_ArrowDown"); // second item
+  checkLoginForm(form.uname, "", form.pword, ""); // value shouldn't update just by selecting
+
+  synthesizeKey("KEY_Enter");
+  await promiseFormsProcessedInSameProcess();
+  is(form.pword.value, "dsdp1prime", "Password should match the login that was selected");
+  checkLoginForm(form.uname, "dsdu1", form.pword, "dsdp1prime");
+});
+</script>
+</pre>
+</body>
+</html>