socks

ssh -D 8080 -f -C -q -N myuser@remote_ssh_server

-D 8080 : This does the dynamic stuff and makes it behave as a SOCKS server.
-f : This will fork the process into the background after you type your password.
-C : Turns on compression.
-q : Quiet mode. Since this is just a tunnel we can make it quiet.
-N : Tells it no commands will be sent. (the -f will complain if we don’t specify this)

In Firefox use about:config

network.proxy.no_proxies_on : localhost, 127.0.0.1, 192.168.0.0/24, .yourcompany.com
network.proxy.socks : 127.0.0.1
network.proxy.socks_port : 8080
network.proxy.socks.remote_dns : true
network.proxy.socks_version : 5
network.proxy.type : 1

using -v instead of -f is more suited for temp. didn't have to rewrite squid ot do much more than firefox settings.