Integration with third-party sites

Hello,

I am planning to create a third-party site, more or less like coversfm.com.

This Chrome extension only works on Lastfm URLs : "http://*.last.fm/*", "http://*.lastfm.ru/* , ....

Can the devs of this plugin allow a method to use the extension on other URLs than Lastfm ?
The URL should match something relevant, like "http://*/lastfm" for example.

Thank you.