Ran into this handy tip while wandering the web. No warranty expressed or implied :)
Firefox is set to default to a dialup connection so it will only download up to 4 things at a time, there is a way to change that IF YOU HAVE A HIGH SPEED INTERNET CONNECTION to download 30 things at a time, it's amazing the difference it makes in browser speed.
Here's How:
WARNING: This tip requires you to make changes to the way FireFox works and if not performed properly can cause performance issues.