Best Firefox Tweak Ever: Reduce RAM Usage
If you wish you could afford a RAM upgrade (like me) and you are using Firefox then you’re probably familiar with what a memory hog it can be. Firefox 2 has proven to be just as excellent a browser as previous versions but that RAM appetite sure hasn’t changed.
Lifehacker has posted a series of tweaks you can make using about:config. I just tried the browser.cache.disk.capacity tweak and it reduced Firefox’s total RAM usage on my MacBook by almost 30%.