Here are some tips I found from Internet. I tried them myself
and it does work. If you have dial-up connection then just skip
it.
Here's something for broadband people that will really speed Firefox up
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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 20.
This means it will make 20 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.