Dunno how many of you know about this, but hey :p
enter 'about:config' in the Address Bar
http://i186.photobucket.com/albums/x12/randomus_robbius/config.jpg
Because Firefox is amazing, if you have 3 you'll see this XD
http://i186.photobucket.com/albums/x12/randomus_robbius/dragons.jpg
Promise to be careful, and insert 'pipe' into the 'Filter' bar (below your tabs) and you'll see these four values (I think there's only 3 on FF2)
http://i186.photobucket.com/albums/x12/randomus_robbius/pipe.jpg
Double click the first 'network.http.pipelining'. The value will change from 'false' to 'true'
http://i186.photobucket.com/albums/x12/randomus_robbius/true1.jpg
Then double click the fourth 'network.http.proxy.pipelining'. That value will also change from 'false' to 'true'
http://i186.photobucket.com/albums/x12/randomus_robbius/true2.jpg
Now double click 'network.http.pipelining.maxrequests'. change the value from 4 to 30, or if you have really fast internet change it to 50
http://i186.photobucket.com/albums/x12/randomus_robbius/50.jpg
Now restart firefox and speed around the tinterwebs even faster ;)