Here's a quick tip to increase page render speeds in Firefox. If you get confused, you can watch this tip on video at CNET TV.
As with most of these tricks, you'll need to head on into about:config.
The new Firefox 3 gives you a little warning when you go there and I will too. You need to be aware that messing about in about:config can destabilize Firefox. There, you've been warned. Now the fun part. Making your own strings.