seeing up a proxy chain with tor airvpn and another proxy using proxifier

[wonderbread 0]

Ok I have been experimenting a little and I need some help. I have been able to connect airvpn through tor by setting the socks 5 proxy on the air vpn client to 127.0.0.1 port 9051. But how do I add a proxy after this step? I dont know how to use proxifier so well but Iam sure its connected to this process somehow. SOuld I just add the proxy in firefox settings? or would that break the airvpn connection?