http://jamespoling.com/2009/01/how-to-double-your-firefox-browsing-speed-with-a-few-easy-tweaks/
Regards...
my theory is, just click faster...read faster.
I did several of these mods a while back and they do work very well. Especially the pipeline thing. I am on DSL and my pages load faster than my buddy who has cable and IE.
Bill