firefox/devtools/client/webconsole/test/browser/test-external-script-errors.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
<!--
  * Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  *
  * Contributor(s):
  *  Patrick Walton <[email protected]>
  *
  -->
    <title>Test for bug 597136: external script errors</title>
  </head>
  <body>
    <h1>Test for bug 597136: external script errors</h1>
    <p><button onclick="f()">Click me</button</p>

    <script type="text/javascript"
      src="test-external-script-errors.js"></script>
  </body>
</html>