There are two HTTP proxies running, apache mod_proxy (8080) and zipproxy (8081). zipproxy compresses any images that go through it. Connections only allowed from localhost, to connect you will probably want some SSH config such as:
Host marmot.wormnet.eu #DynamicForward localhost:1080 LocalForward 127.0.0.1:8080 127.0.0.1:8080 LocalForward 127.0.0.1:8081 127.0.0.1:8081
Configure your browser on a slow connection to use localhost:8081 for HTTP, and HTTPS/everything else via localhost:8080. Of course on a speedy connection, shovel everything through localhost:8080 (or use the built in SSH SOCKS5 support).