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diff --git a/toolkit/components/passwordmgr/test/mochitest/test_autofill_username-only_threshold.html b/toolkit/components/passwordmgr/test/mochitest/test_autofill_username-only_threshold.html
new file mode 100644
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+++ b/toolkit/components/passwordmgr/test/mochitest/test_autofill_username-only_threshold.html
@@ -0,0 +1,83 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test autofill on username-form when the number of form exceeds the lookup threshold</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="pwmgr_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+Test not autofill on username-form when the number of form exceeds the lookup threshold
+
+<script>
+add_setup(async () => {
+  await SpecialPowers.pushPrefEnv({"set": [["signon.usernameOnlyForm.lookupThreshold", 5]]});
+
+  await setStoredLoginsAsync(
+    [window.location.origin, "https://autofill", null, "user1", "pass1"]
+  );
+});
+
+add_task(async function test_autofill_username_only_form() {
+  const win = window.open("about:blank");
+  SimpleTest.registerCleanupFunction(() => win.close());
+
+  await loadFormIntoWindow(window.location.origin, `
+    <!-- no password field, 1 username field -->
+    <form id='form1' action='https://autofill'> 1
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>
+
+    <form id='form2' action='https://autofill'> 2
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>
+
+    <form id='form3' action='https://autofill'> 3
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>
+
+    <form id='form4' action='https://autofill'> 4
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>
+
+    <form id='form5' action='https://autofill'> 5
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>
+
+    <form id='form6' action='https://autofill'> 6
+        <input type='text' name='uname' autocomplete='username' value=''>
+
+        <button type='submit'>Submit</button>
+        <button type='reset'> Reset </button>
+    </form>`, win, 5);
+
+  await checkLoginFormInFrameWithElementValues(win, 1, "user1");
+  await checkLoginFormInFrameWithElementValues(win, 2, "user1");
+  await checkLoginFormInFrameWithElementValues(win, 3, "user1");
+  await checkLoginFormInFrameWithElementValues(win, 4, "user1");
+  await checkLoginFormInFrameWithElementValues(win, 5, "user1");
+  await checkUnmodifiedFormInFrame(win, 6);
+});
+</script>
+
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test"></pre>
+</body>
+</html>