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diff --git a/toolkit/components/passwordmgr/test/mochitest/test_form_action_javascript.html b/toolkit/components/passwordmgr/test/mochitest/test_form_action_javascript.html
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index 0000000000..717805f06a
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+++ b/toolkit/components/passwordmgr/test/mochitest/test_form_action_javascript.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test forms with a JS submit action</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>
+Login Manager test: form with JS submit action
+<script>
+
+add_setup(async () => {
+  await setStoredLoginsAsync(
+    [location.origin, "javascript:", null, "jsuser", "jspass123", "uname", "pword"]
+  );
+});
+
+/** Test for Login Manager: JS action URL **/
+add_task(async function startTest() {
+  const win = window.open("about:blank");
+  SimpleTest.registerCleanupFunction(() => win.close());
+  await loadFormIntoWindow(location.origin, `
+    <form id='form1' action='javascript:alert("never shows")'> 1
+      <input name="uname">
+      <input name="pword" type="password">
+
+      <button type='submit'>Submit</button>
+      <button type='reset'> Reset </button>
+    </form>`, win);
+
+  await checkLoginFormInFrameWithElementValues(win, 1, "jsuser", "jspass123");
+});
+</script>
+
+<p id="display"></p>
+
+<div id="content" style="display: none">
+</div>
+
+<pre id="test"></pre>
+</body>
+</html>