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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test autocomplete due to multiple matching logins</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>
+Login Manager test: autocomplete due to multiple matching logins
+<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">
+/** Test for Login Manager: autocomplete due to multiple matching logins **/
+
+add_setup(async () => {
+  await addLoginsInParent(
+    [location.origin, "https://autocomplete:8888", null, "name", "pass", "uname", "pword"],
+    [location.origin, "https://autocomplete:8888", null, "Name", "Pass", "uname", "pword"],
+    [location.origin, "https://autocomplete:8888", null, "USER", "PASS", "uname", "pword"]
+  );
+})
+
+add_task(async function test_empty_first_entry() {
+  const form = createLoginForm({
+    action: "https://autocomplete:8888"
+  });
+
+  // Make sure initial form is empty.
+  checkLoginForm(form.uname, "", form.pword, "");
+
+  // Trigger autocomplete popup
+  form.uname.focus();
+
+  let popupState = await getPopupState();
+  is(popupState.open, false, "Check popup is initially closed");
+  const { items } = await openPopupOn(form.uname);
+  popupState = await getPopupState();
+  is(popupState.selectedIndex, -1, "Check no entries are selected");
+  checkAutoCompleteResults(items, ["name", "Name", "USER"], "example.com", "initial");
+
+  // Check first entry
+  const index0Promise = notifySelectedIndex(0);
+  synthesizeKey("KEY_ArrowDown");
+  await index0Promise;
+  checkLoginForm(form.uname, "", form.pword, ""); // value shouldn't update
+  synthesizeKey("KEY_Enter");
+  await promiseFormsProcessedInSameProcess();
+  checkLoginForm(form.uname, "name", form.pword, "pass");
+});
+
+add_task(async function test_empty_second_entry() {
+  const form = createLoginForm({
+    action: "https://autocomplete:8888"
+  });
+
+  await openPopupOn(form.uname);
+  synthesizeKey("KEY_ArrowDown"); // first
+  synthesizeKey("KEY_ArrowDown"); // second
+  synthesizeKey("KEY_Enter");
+  await promiseFormsProcessedInSameProcess();
+  checkLoginForm(form.uname, "Name", form.pword, "Pass");
+});
+
+add_task(async function test_empty_third_entry() {
+  const form = createLoginForm({
+    action: "https://autocomplete:8888"
+  });
+
+  await openPopupOn(form.uname);
+  synthesizeKey("KEY_ArrowDown"); // first
+  synthesizeKey("KEY_ArrowDown"); // second
+  synthesizeKey("KEY_ArrowDown"); // third
+  synthesizeKey("KEY_Enter");
+  await promiseFormsProcessedInSameProcess();
+  checkLoginForm(form.uname, "USER", form.pword, "PASS");
+});
+
+add_task(async function test_preserve_matching_username_case() {
+  const form = createLoginForm({
+    action: "https://autocomplete:8888"
+  });
+  await promiseFormsProcessedInSameProcess();
+
+  await openPopupOn(form.uname, { inputValue: "user" });
+  // Check that we don't clobber user-entered text when tabbing away
+  // (even with no autocomplete entry selected)
+  synthesizeKey("KEY_Tab");
+  await promiseFormsProcessedInSameProcess();
+  checkLoginForm(form.uname, "user", form.pword, "PASS");
+});
+</script>
+</pre>
+</body>
+</html>