Link to the advisory is http://secunia.com/advisories/23108/
The advisory lists the following workarounds as a solution:
Solution:
Disable the "Automatically Fill Passcard" or "Automatically Log In" option in the preferences of Passcard Manager and always check the URL before invoking it.
Related Firefox thread reported by geffr is here.
Password Manager implementation is known as Passcard Manager in the newest Netscape. A new reason to release fixed 8.1.x version again.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.0; fi; rv:1.8.0.8) Gecko/20061025 Firefox/1.5.0.8
