To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
POF and FF11 Rated 5 out of 5 stars
I had the same problem. My solution:
Change the value "maxVersion" to 14.0
( <em:maxVersion>14.0</em:maxVersion> )
at the "install.rdf" file located in the extension folder of POF