title: Javascript URL inside an iframe does not execute in Firefox
body: <p>I have written this code for Firefox:</p>
  
  <pre><code>&lt;html&gt;&lt;head&gt;&lt;title&gt;No&lt;/title&gt;
  &lt;script type="text/javascript" src="jquery-1.4.2.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;form action="javascript:void(alert('Yes'));"&gt;
  &lt;input type="submit" value="Submit"&gt;
  &lt;/form&gt;
  &lt;script&gt;$($('form').submit())&lt;/script&gt;&lt;/body&gt;&lt;/html&gt;
  </code></pre>
  
  <p>It correctly displays the alert box.
  However, when i run this inside an iframe, with this code:</p>
  
  <pre><code>&lt;html&gt;&lt;body&gt;&lt;iframe src="click.php"&gt;&lt;/iframe&gt;&lt;/body&gt;&lt;/html&gt;
  </code></pre>
  
  <p>i don't get the alert box, not even if i click the submit button myself.
  What is going on exactly? The same code works in Chromium</p>