Just copied the instructions below and Firefox is so much faster now .
Speed Up FireFox:
This worked great for me.
Here's something for broadband people that will really speed Firefox up:
1. Type "about:config" into the address bar and hit return. Scroll down and look for the following entries:
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" from False
Set "network.http.proxy.pipelining" to "true" from False
Set "network.http.pipelining.maxrequests" to some number like 30. This means it will make 30 requests at once. From 4
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 receives.
If you're using a broadband connection you'll load pages MUCH faster now!