How do I add a src file to Firefox?
Here's my understanding of doing that process directly:
Copy it to your desktop and CTRL-C it.
Go to the Firefox installation directory [in winXP under C:\Program Files\Mozilla Firefox]
Open the searchplugins folder
Paste the .src file.
Dunno if that will work, seems like it oughta if you're having trouble. I'm not a Firefox authority, though. I will be using IE until I feel safe enough migrating to FF (and until I can get my stupid site admin up here to permit me to do it! #$@$@%@#@#@$#!).