Jyxo\FirePhp::isInstalled PHP Method

    private static function isInstalled() : bool
    {
        // Header X-FirePHP-Version
        if (isset($_SERVER['HTTP_X_FIREPHP_VERSION'])) {
            return true;
        }
        // Header x-insight
        if (isset($_SERVER['HTTP_X_INSIGHT']) && 'activate' === $_SERVER['HTTP_X_INSIGHT']) {
            return true;
        }
        // Modified user-agent
        if (isset($_SERVER['HTTP_USER_AGENT']) && false !== strpos($_SERVER['HTTP_USER_AGENT'], 'FirePHP/')) {
            return true;
        }
        // Not installed
        return false;
    }