Hey! You can mail me at alex@aegabriel.com. Alternately, to send a quick message to me use the site request form below. I have accounts on these music sites if you would like to see what I use this extension for: Grooveshark and LastFM.
The source for the extension is also available on GitHub. All issues will be logged to the issue tracker there. Feel free to log issues, fix bugs, fork the repo, anything you want :)