if( location.href.indexOf( 'etsy.com/receipt.php' ) == -1 ) {
    // not on a receipt page - stop working
    return
}
// find the buyer's feedback page address
// it's a horrifically long set of chained methods which just work through the
// page's structure to find the table with the buyer information on it
i=document.getElementsByTagName('table')[(location.search.match('show_panel=true'))?22:21].getElementsByTagName('tr')[0].getElementsByTagName('a')[0].href.replace('profile','feedback_public');

// set the location to the buyer's feedback page
location=i;