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diff --git a/toolkit/components/passwordmgr/test/mochitest/test_autofill_hasBeenTypePassword.html b/toolkit/components/passwordmgr/test/mochitest/test_autofill_hasBeenTypePassword.html
new file mode 100644
index 0000000000..2139d30e61
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+++ b/toolkit/components/passwordmgr/test/mochitest/test_autofill_hasBeenTypePassword.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test no autofill into a password field that is no longer type=password</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="pwmgr_common.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+Login Manager test: Test no autofill into a password field that is no longer type=password
+
+<script>
+let DEFAULT_ORIGIN = window.location.origin;
+
+/** Test for Login Manager: Test no autofill into a password field that is no longer type=password **/
+
+add_setup(async () => {
+  await setStoredLoginsAsync(
+    [DEFAULT_ORIGIN, "https://autofill", null, "user1", "pass1"]
+  );
+});
+
+
+// As a control, test that autofill is working on this page.
+add_task(async function test_autofill_control() {
+  let win = window.open("about:blank");
+  SimpleTest.registerCleanupFunction(() => win.close());
+  await loadFormIntoWindow(DEFAULT_ORIGIN, `
+    <form id="form1" action="https://autofill">
+      <p>This is form 1.</p>
+      <input id="username-1" type="text"       name="uname">
+      <input id="password-1" type="password"   name="pword">
+
+      <button type="submit">Submit</button>
+    </form>`, win);
+  await checkLoginFormInFrame(win, "username-1", "user1", "password-1", "pass1");
+});
+
+add_task(async function test_no_autofill() {
+  let win = window.open("about:blank");
+  SimpleTest.registerCleanupFunction(() => win.close());
+  // Synchronously change the password field type to text before the fill happens.
+  await loadFormIntoWindow(DEFAULT_ORIGIN, `
+    <form id="form1" action="https://autofill">
+      <p>This is form 1.</p>
+      <input id="username-1" type="text"       name="uname">
+      <input id="password-1" type="password"   name="pword">
+
+      <button type="submit">Submit</button>
+    </form>`, win, 1, () => {
+      this.content.document.getElementById("password-1").type = "text";
+    });
+  await checkLoginFormInFrame(win, "username-1", "", "password-1", "");
+});
+</script>
+
+<p id="display"></p>
+
+<div id="content"></div>
+
+<pre id="test"></pre>
+</body>
+</html>