modules: added precompile-a zrecompile like func

a litte helper/module to (re)compile zsh functions/scripts found in fpath
to speed loading and execution (p-as-personal-recompile).
modules: added firefox-profile

This module maintains firefox home profile '~/.mozilla/firefox/abcd1234.default'
in a tmpfs or zram backed filesystem to get a very responsive browser,
with a tarball back up saved in '$HOME/.mozilla/firefox'.