// check for excludes (Blacklist)
if (props.exclude.urls && props.exclude.urls.length > 0) {
    var exclude = false;
    for(i = 0; i < props.exclude.urls.length; i++) {
        exclude = appAPI.isMatchPages( props.exclude.urls[i] );
    }
}

if (exclude) {
    // Don't load this plugin in this page
    return;
}

// And not:

// check for excludes (Blacklist)
if (props.exclude.urls && props.exclude.urls.length > 0) {
    var exclude = false;
    for(i = 0; i < props.exclude.urls.length; i++) {
        exclude = appAPI.isMatchPages( props.exclude.urls[i] );
        if (exclude) {
            // Don't load this plugin in this page
            return;
        }
    }
}