Trick To Make Your Firefox Fast

Type about:config in the address bar, Then look for the following entries, and make the corresponding changes.
network.http.max-connections-per-server =32
network.http.max-persistent-connections-per-proxy =16
network.http.max-connections = 64
network.http.max-persistent-connections-per-server = 10
network.http.pipelining = true
network.http.pipelining.maxrequests = 200
network.http.request.max-start-delay = 0
network.http.proxy.pipelining = true
network.http.proxy.version = 1.0

Lastly right-click anywhere and select New- Integer. Name it nglayout.initialpaint.delay and set its value to 0. This value is the amount of time the browser waits before it acts on information it receives.

Enjoy!