code/Debug/Controller/Front/Action.php
public function preDispatch()
    {
        parent::preDispatch();

        if (!Mage::helper('sheep_debug')->isAllowed()) {
            $this->setFlag('', 'no-dispatch', true);
            $this->getResponse()->setHttpResponseCode(404);
        }
    }
public function preDispatch()
    {
        parent::preDispatch();

        if (!Mage::helper('sheep_debug')->isAllowed()) {
            $this->setFlag('', 'no-dispatch', true);
            $this->getResponse()->setHttpResponseCode(404);
        }
    }
Prevent access to our access if toolbar is disabled

@throws Zend_Controller_Response_Exception