The successor to PFM is PIX Device Manager (PDM), which will work with browsers on Windows 95, 98, NT, and 2000. PDM should be available at the time of the release of PIX 6.0 code.
Cisco PIX Device Manager is included as part of Cisco PIX operating systems version 6.0 and higher. A separate license for PDM is not required. A DES or 3DES license is required, as PDM only supports encrypted communication. If your PIX is not currently encryption enabled you can request a free DES activation key by completing the following form:
http://www.cisco.com/public/sw-center/internet/pix-56bit-license-request.shtml
3DES keys are available as part of a feature license upgrade.