if( location.href.indexOf('etsy.com/view_listing') == -1 ) {
    // not on a listing page - stop working
    return
}

a=document.getElementsByTagName('a');
var ys,ts;

// loop through the links on the page looking for shop links
for( l = 0; l < a.length; l++ ) {
    k = a[l];
    if( k.href ) { 
        m = /shop.php\?user_id=(\d+)/.exec(k.href);
        if( m ) {
            if ( k.title == 'Your Shop' ) {
                // capture my shop ID
                ys = m[1]
            } else if ( k.firstChild && k.firstChild.data && k.firstChild.data == 'shop' ) {
                // capture the current shop's ID
                ts = m[1];
                break
            }
        }
    }
}

if( ys == ts ){
    // this is in my shop - I should go to the edit page
    m = location.search.match(/listing_id=(\d+)/);
    location = 'http://www.etsy.com/reactivate_listing.php?listing_id=' + m[1];
}