1. Type "about:config" into the address bar and hit return. Scroll
down  and look for the following entries:
network.http.pipelining
network.http.proxy.pipelining
network.http.pipelining.maxrequests
Normally  the browser will make one request to a web page at a time.
When you  enable pipelining it will make several at once, which really
speeds  up page loading.
2. Alter the entries as follows:
Set  "network.http.pipelining" to "true"
Set  "network.http.proxy.pipelining" to "true"
Set  "network.http.pipelining.maxrequests" to some number like 30. This
means  it will make 30 requests at once.
3. 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 recieves.
If  you're using a broadband connection you'll load pages 2-30 times faster  now.
How to speed up mozilla firefox 3-30x times
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