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Save the "wso.jpg" file in the same "searchplugins" folder. That's it. Restart firefox. Now, when you click on the icon or little triangle next to your Firefox search box, the drop-down menu should show "WSO Facebook" as one of the search engines you can use. Let me know if it's working properly. You'll probably need to be on campus for it to work.
Note: This is stolen from Ronit Bhattacharyya's blog. I changed the pic, though, to use the WSO "W" instead of the Williams "W"(a fine distinction).