Squid

Squid is a proxy server to speed up web browsing, and web serving.

Emerge
Install :

OpenRC
To start squid on boot:

To start squid immediately:

Firefox
Set firefox to manual proxy, and point it @ localhost port 3128 or 127.0.0.1 port 3128.

Custom Error Page Icons
CSS controlls the squid icon on error pages, to insert your own icon simply replace the link url in /etc/squid/errorpage.css section #titles (so long as you use a 91x50 pixel image you can get away with changing nothing. if you want a different size image padding is .5 x height, and padding left is exactly width of future image replacement.

Once done editing