I just came across "AWS Firewall Manager" – https://aws.amazon.com/firewall-manager/
I haven’t seen any mention of this in the Cert Sec. Specialty courses. Is it on the exam? I didn’t even know it existed until a few minutes ago!
I don’t recall anything related to this exact area on my exam from a few weeks ago (11/2019).
To the best of my knowledge, this doesn’t exist in the AWS Certification Exam yet. We do keep track of the feedback from our students, so if people are spotting Firewall Manager, we’d be interested to know so we can update the course