file_localStorage.html

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<!DOCTYPE html>

<html>

<head>

  <title>Bug 1663192 - Accessing localStorage in a file urls</title>

</head>

<script>

  window.addEventListener("DOMContentLoaded", () => {

    let result = document.getElementById("result");

    try {

      window.localStorage.setItem("foo", "bar");

      result.textContent = "PASS";

    } catch (e) {

      result.textContent = "FAIL";

  }, { once: true });

</script>

<body>

<a id="result"></a>

</body>

</html>