How to route socks5 proxy?

Question

linux

1. I create ssh proxy on local system
ssh -f -C2qTnN -D 9987 [email protected]
2. In Firefox I specify socks5 proxy 127.0.0.1:9987
3. On server xxx.xxx.xxx.xxx I create ssh -proxy
ssh -f -C2qTnN -D 9988 [email protected]

Question:
how to redirect all socks5 traffic through the ssh tunnel yyy.yyy.yyy.yyy
for the first server using standard means

Answer 1

Google on "socks proxy chaining" turned up a question on StackOverflow .
The essence of the answer from there:
You can simply forward the local port to the first server in the chain, and access it:
ssh -L 9987:localhost:9988 [email protected]