file_insecure_favicon.html

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<!DOCTYPE HTML>

<html>

  <head>

    <meta charset='utf-8'>

    <title>Favicon Test for mixed content</title>

    <link rel="icon" type="image/png" href="http://example.com/browser/browser/base/content/test/favicons/file_favicon.png" />

  </head>

  <body>

    Favicon!!

  </body>

</html>