1) Download Dataram Ramdisk directly from this link http://adf.ly/Fr1ff

2) Install & configure Ramdisk.

3) in Firefox, type about:config

4) Make new String “browser.cache.disk.parent_directory”

5) Set value “K:\fftemp", replacing K with your Ramdisk drive letter.

Done!

Note: Firefox might not respect the size limit for it’s cache directory! Missing pictures in Firefox etc. will ensue if the cache drive gets full.