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diff --git a/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_highlight_username_only_form.html b/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_highlight_username_only_form.html
new file mode 100644
index 0000000000..884bdc66d3
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+++ b/toolkit/components/passwordmgr/test/mochitest/test_autocomplete_highlight_username_only_form.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test form field autofill highlight</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>
+<p id="display"></p>
+<div id="content"></div>
+<pre id="test">
+<script>
+const { ContentTaskUtils } = SpecialPowers.ChromeUtils.import(
+  "resource://testing-common/ContentTaskUtils.jsm"
+);
+
+add_setup(async () => {
+  await addLoginsInParent(
+    [location.origin, "https://autocomplete", null, "user1", "pass1", "", ""],
+    [location.origin, "https://autocomplete", null, "user2", "pass2", "", ""]
+  );
+});
+
+add_task(async function test_username_field_in_username_only_form_highlight_on_autocomplete() {
+  const form = createLoginForm({
+    action: "https://autocomplete",
+    username: {
+      autocomplete: "username"
+    },
+    password: false
+  });
+
+  await openPopupOn(form.uname);
+  synthesizeKey("KEY_ArrowDown");
+  await synthesizeKey("KEY_Enter");
+
+  await ContentTaskUtils.waitForCondition(() => {
+    return form.uname.matches(":autofill");
+  }, "Highlight was successfully applied to the username field on username autocomplete");
+
+  // Clear existing highlight on login fields. We check by pressing the tab key after backspace
+  // (by shifting focus to the next element) because the tab key was known to cause a bug where the
+  // highlight is applied once again. See Bug 1526522.
+  form.uname.focus();
+  synthesizeKey("KEY_Backspace");
+  synthesizeKey("KEY_Tab");
+  ok(!form.uname.matches(":autofill"),
+     "Highlight was successfully removed on the username field");
+});
+</script>
+</body>
+</html>