UPDATE
The server should now be more reliable for anyone looking to use this add-on. I moved the server into a server closet and switched from Windows 2k to Ubuntu. Windows 2k seemed to be corrupt, causing it to act up every now and then. This was causing many of the outages it's had.
This server will be reliable since I'm going to be starting a small business in a few months (hopefully) and this is the box it will initially be hosted on. Should be smooth sailing from here on out.
The address is:
http://www.jamesoft.net/AddZilviaSearch_Firefox.html