Speeding up firefox 3

In the about:config enable the setting network.dns.disableIPv6 (double click will suffice).
Then install the Flashblock Firefox extension to load the Flash stuff only when you want.
Additionally try to use the fastest SDD drive for the FF cache, instructions below:

• Open a new tab and type about:config into the address bar.
  
• Right-click anywhere in the lower part of the screen and choose new->integer.
• Name the new setting ‘toolkit.storage.synchronous’
• In the second popup, set the value to 0 (zero). This tells the browser not to wait while writing files.
• Create a new string called ‘browser.cache.disk.parent_directory’
• Set its value to ‘/dev/shm/firefox-yourusername’. This tells the browser to use a RAM disk instead of the SSD.

The above procedure placaes the cache in the RAM, however this means it will be lost when shutting down the computer.