This trick may be known to some, but it's definitely worth posting. I got a noticeable speed improvement loading web pages by changing these settings in Firefox
1. Type "about
:config" in the adress field.
2. Set the value of network.http.pipelining to "true".
3. Set the value of network.http.pipelining.maxrequests to "100".
4. Set the value of network.http.proxy.pipelining to "true"
5. Set the value of nglayout.initialpaint.delay to "0"
(found in http://www.computerbb.org/about150.html
For those who want to dabble with the config file even more, there's some good info at the Mozillazine forum in this