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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mozInputSource — detect</title>
</head>
<body>
  <p>Click to feature-detect mozInputSource.</p>
  <pre id="out">—</pre>
  <script>
    document.addEventListener("click", function (e) {
      var out = document.getElementById("out");
      if (typeof e.mozInputSource !== "number") {
        out.textContent = "mozInputSource not supported in this browser";
        return;
      }
      out.textContent = "Supported. Source code: " + e.mozInputSource;
    });
  </script>
</body>
</html>

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MouseEvent.mozInputSource — feature-detect (Try It)