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What happens if I use VPN and then configure my firefox browser to use SOCKS proxy? Am I then behind both or just proxy?

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up vote 2 down vote accepted

Firefox tries to connect to the SOCKS proxy server normally, but your operating system is routing all the traffic through the VPN server. So what happens simply is:

Browser -> VPN Server -> SOCKS Server -> Destination server

So, yes. You're behind both of them.

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I believe you are behind both. When you are connected to a VPN all N/W connections to internet from all your applications is going through VPN. Again Firefox is an application and You are making a proxy connection to your proxy server.The server sees the VPN IP as your source IP.So You are behind both.

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