Netscape 6.0 – Prefill Option ??

Netscape6.0 has a feature “Prefill Form” which stores the data in the form of the 1st User .But this important data can be used by the Second user also , which makes the data of 1st user insecure ,transperant..
Is there any way that we can avoid Prefill Form in Netscape6.0 not Manually but using some Tags in any Language ????