src/Extensions/ThemeManager.php
public function getActive()
    {
        return $active = Settings::getByName(self::ACTIVE_KEY) ?: ($this->config->get(self::ACTIVE_KEY) ?: 'default');
    }
public function getActive()
    {
        return $active = Settings::getByName(self::ACTIVE_KEY) ?: ($this->config->get(self::ACTIVE_KEY) ?: 'default');
    }
The id's of the enabled extensions.

@return array