SOCKS5 Firefox can control which side of the proxy handles DNS lookups. By
default, it does the lookups locally resulting in the scenario above. To change
this, set network.proxy.socks_remote_dns = true in about:config. This makes the
SOCKS proxy more like a regular proxy, where DNS is handled by the remote end
of the tunnel.

----- about:config
network.proxy.socks_remote_dns = true

----- create a SOCKS proxy
ssh -D 9999 username@ip-address-of-ssh-server