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"

Now watch as the loading times that already beat IE's go into overkill mode.

Yep, Tested it myself. Increases Mozilla Firefox speed and MAY also work for Mozilla.

Taken from http://www.computerbb.org/about150.html