public function loadWebmasterSites(AccountInterface $account)
    {
        $roles = $this->getAccess()->getUserRoles($account);

        foreach ($roles as $grant) {
            if ($grant->getRole() !== Access::ROLE_WEBMASTER) {
                unset($roles[$grant->getSiteId()]);
            }
        }

        return $this->getStorage()->loadAll(array_keys($roles));
    }