Copy/pasted the code in notepad++, saved as .xml, put into the correct folder and nothing. Opened the file and received the following:
Code:
XML Parsing Error: prefix not bound to a namespace
Location: file:///C:/Program%20Files/Mozilla%20Firefox/searchplugins/wowinterface.xml
Line Number 2, Column 1:<os:ShortName>WoWInterface</os:ShortName>
Windows XP Home
Firefox 3.5.6