Using proxmox firewall. How does it work? How does it work with bridge?

I am currently not using proxmox firewall. I have a single vlan aware bridge vmbr0 and all VMs/CTs use it along with a VLAN tag (or none, if they need access to all VLANs such as a virtual router).

If I were to enable the firewall, what would happen? What would happen to my bridge and where would the firewall be exactly inserted? Would it be ebtables rules or iptables rules? And in the latter case, how? It would need to different L2 networks...

The reason why I am asking and why I am so...

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