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.
