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https://bugzilla.mozilla.org/show_bug.cgi?id=612267
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  <title>Test for Bug 393974</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=612267">Mozilla Bug 612267</a>
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<pre id="test">
<script class="testbody" type="text/javascript">

Window.prototype.test = 'PASS';
is(window.test, 'PASS', "setting Window.prototype affects window.__proto__");
is(test, 'PASS', "setting Window.prototype affects the inner window lookup for sure");

</script>
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