You can set an HTML breakpoint<http://getfirebug.com/wiki/index.php/HTML_Panel#Node_View>at your hidden field. Therefore right-click the element you want to observe and choose *Break On Attribute Change* and *Break On Child Addition or Removal*. Now reload the page. In the case the form element gets changed on page load, Firebug should switch to the *Script* panel<http://getfirebug.com/wiki/index.php/Script_Panel>and the script execution should stop at the line, that changed the HTML.
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