Found this recently, and it works a treat ~

Speed up Firefox. If you have a broadband connection (and most of us do), you can use pipelining to speed up your page loads. This allows Firefox to load multiple things on a page at once, instead of one at a time (by default, it’s optimized for dialup connections). Here’s how:

    * Type “about:config” into the address bar and hit return. Type “network.http” in the filter     
       field, and change the following settings (double-click on them to change them):
    * Set “network.http.pipelining” to “true”
    * Set “network.http.proxy.pipelining” to “true”
    * Set “network.http.pipelining.maxrequests” to a number like 30. This will allow it to make 30
      requests at once.
    * Also, 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 receives.

Works on the Mac!!!

Thanks for posting this

I was amazed Rick... Skinbase has to be the slowest loading site on the web, but after making these changes it leaps onto the screen. 

dude, thanks so much for this!!!!

Be sure to check the "nglayout.initialpaint.delay" if you update to a newer version of Firefox... I was getting really gnarled off with my machine until I checked and found that FF defaults to '300' when updated... set it to '0' and you can join the Wright Brothers once again...