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https://bugzilla.mozilla.org/show_bug.cgi?id=789856
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  <meta charset="utf-8">
  <title>Test for Bug 789856</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=789856">Mozilla Bug 789856</a>
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<pre id="test">
<script type="application/javascript">

/** Test for Bug 789856 **/
SimpleTest.waitForExplicitFinish();

var script = document.createElement("script");
script.onload = function() {
  ok(false, "This script should not load");
  SimpleTest.finish();
}
script.onerror = function() {
  ok(true, "This script should fail to load");
  SimpleTest.finish();
}
// If neither one fires,  the test fails, as it should

// Use a URL the test is not allowed to load
script.src = "file:///tmp/"
document.body.appendChild(script);

</script>
</pre>
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