I have a windows machine from which I can ssh into a unix machine with NX called 'London'. Here I can browse the web with firefox after I set the proxy to 'proxy3.com' and port 3128. At startup it asks for username and password I type it in and everything works fine.
The problem is that firefox is slow in NX so I thought it would be much better to tunnel to London and use a browser locally on my windows machine, but I don't know how to set up London to use proxy for this connection. I don't have root access to it, so I can't use export.