found this on another forum. worked great for speeding up firefox, according to the 20 + replys, also theres an extension
here the tweaks meant to be better though

I'm still on IE so don't know, try it and see for yourself

let us know
If you want to increase the speed of your browsing with Firefox, follow these simple directions:
Open Firefox.
Type "about
:config" in the adress bar (no quotation marks).
Find these options, double click each one and change to below values:
network.http.max-connections: 48
network.http.max-connections-per-server: 24
network.http.max-persistent-connections-per-proxy: 12
network.http.max-persistent-connections-per-server: 6
network.http.pipelining: true
network.http.pipelining.maxrequests: 32
network.http.proxy.pipelining: true
Close Firefox and enjoy the faster browsing.