*/!\ firefox-tmpfs-daemon is deprecated and has not been ported to AUR4. /!*
*/!\ You should use profile-sync-daemon instead /!*
firefox-tmpfs-daemon in an init script for Archlinux available on AUR. It synchronizes all ~/.mozilla directories to tmpfs at boot and stop time.
See instructions on the official topic.
Install with yaourt :
yaourt -S firefox-tmpfs-daemon