Make session unique to user's user agent

@anuj423: where did you place this code in AutologoutManager.php exactly?

I found:
autologout/src/AutologoutManager.php

  public function logout() {
    $user = $this->currentUser;
    if ($this->autoLogoutSettings->get('use_watchdog')) {
      $this->logger->info(
        'Session automatically closed for %name by autologout.',
        ['%name' => $user->getAccountName()]
      );
    }

    // Destroy the current session.
    if (!array_key_exists('HTTP_USER_AGENT', $_SESSION)) {
      $_SESSION['HTTP_USER_AGENT'] = $_SERVER['HTTP_USER_AGENT'];
    }

    if ($_SESSION['HTTP_USER_AGENT'] != $_SERVER['HTTP_USER_AGENT']) {
      $this->moduleHandler->invokeAll('user_logout', [$user]);
      $this->session->destroy();
      $user->setAccount(new AnonymousUserSession());
    }
  }