Next MCMS post-SP2 fix correcting 3rd browser problems has been released today.
Postbacks on Firefox and Netscape browsers do not work correct
This will only happen if the <base> tag rendering using the RobotMetaTag control has been disabled. As a workaround either enable the <base> tag rendering or (if this is not an option) add the following javascript code behind the form tag of your template:
<script language="javascript">
if (window.navigator.appName.toLowerCase().indexOf("microsoft") == -1
&& typeof __CMS_PostbackForm.onsubmit == "undefined")
{
__CMS_PostbackForm.onsubmit = null;
}
</script>
The hotfix to resolve this problem has been released and can be requested from Microsoft Support as KB 914782
