Free Plugin Downloads and Instructions:

Windows  Click for Automatic set-up

Mac OSX   Click for Automatic set-up

Vista-FireFox :   Manual set-up

Print these instructions and follow carefully
Click on above link
1. New window opens: "Port 25" 
   A.  Close all browsers except "Port 25"
    B.  Click "Download Now"
   C.  Close "Port 25"
2. New Window opens: "wmpfirefoxplugin.exe", Save file
3. New Window opens::  "Downloads"
    A. Double click on the "wmpfirefoxplugin.exe" from "downloads list".
     B. Click "OK" at warning.
     B. Close "Downloads" window.
4.  All browsers should be closed with exception to the set-up:
          Click "Run".
5.  Click "Continue" and follow set-up procedure.
6.  Reboot to activate Plugin.