FressRSS/app/views/entry/bookmark.phtml

<?php
header('Content-Type: application/json; charset=UTF-8');

if (Minz_Request::param('is_favorite', true)) {
	Minz_Request::_param('is_favorite', 0);
} else {
	Minz_Request::_param('is_favorite', 1);
}

$url = Minz_Url::display(array(
	'c' => Minz_Request::controllerName(),
	'a' => Minz_Request::actionName(),
	'params' => Minz_Request::params(),
));

FreshRSS::loadStylesAndScripts();
echo json_encode(array('url' => str_ireplace('&amp;', '&', $url), 'icon' => _i(Minz_Request::param('is_favorite') ? 'non-starred' : 'starred')));