sometimes it is very useful to have http access into a remote network but you can only reach one single linux machine inside this network. there is a simple way to tunnel http requests from firefox through your ssh connection:
connect with the -D option to set up the proxy service
ssh -D 1080 user@some.server.somewhere
this will now run a local socks proxy on localhost:1080
in order to get firefox to use this tunnel, you need to configure a socks proxy in firefox. since you might want to switch this proxy on and off several times it is a good idea to use an add-on to do this, so it can be done with a single button:
[Socks Proxy socks=127.0.0.1:1080 noProxy=127.0.0.1:8080 config:network.proxy.socks_remote_dns=true ]