Add to fstab:
tmpfs /tmp tmpfs mode=0777 0 0
Firefox:
browser.cache.disk.parent_directory=/tmp/ram
Chromium: just change launcher to
/opt/google/chrome/google-chrome --disk-cache-dir="/tmp/ram/"
Ref: http://www.linuxreaders.com/2011/01/11/firefox-chrome-cache-on-ram-drive-fedora-ubuntu/
~~LINKBACK~~ ~~DISCUSSION~~