2.Write network.http in the filter window to decrease the swarm of configs.
3.Double click on network.http.pipelining to set it as true.
4.Set network.http.pipelining.maxrequests as 30 (then Firefox will do up to 30 enquiries each ti'me).
5.Set network.http.proxy.pipelining as true.
6.Right click anywhere in teh list and do New -> Integer, set the name as nglayout.initialpaint.delay and set the value to 0.
7.Reset Firefox.
Hope this helps