Fasten your Firefox belts

With these tweaks you can speed up your Firefox and make it more reliable by reducing it’s memory footprint. Go to your about:config page and enter the following values, create them if they don’t exist yet:

1. Fetch only pages that you click
   network.prefetch-next=false
2. Limit the RAM usage
   browser.cache.memory.capacity=15000
3. Reducing the RAM usage even more when Firefox gets minimized
   config.trim_on_minimize=true
4. Make pages load faster
   network.http.pipelining=true

On this page is an explanation why these tweaks make your Fx faster.