Invoke latest Firefox with switching settings.

firefox-latest.zsh

#!/bin/zsh --extended-glob

# If $1 == --profile
# use directory $2 instead".${profile_dir:-latest}"

if [[ $1 == --profile ]]
then
  shift
  profile_dir="$1"
  shift
fi

print $profile_dir

# If .moziila is not for".${profile_dir:-latest}" Firefox.
# (#q:A) means expand symbolic link
if [[ -e ~/.mozilla && $( print ~/.mozilla(#q:A) ) != */.mozilla".${profile_dir:-latest}"  ]]
then

  # Abort if .mozilla is a directory
  if [[ ! -h ~/.mozilla && -d ~/.mozilla ]]
  then
    print .mozilla is a directory. >&2
    exit 1
  fi
  
  # Link .mozilla for".${profile_dir:-latest}" Firefox if any.
  if [[ -e ~/.mozilla".${profile_dir:-latest}" ]]
  then
    [[ -h ~/.mozilla ]] && rm ~/.mozilla
    ln -sf ~/.mozilla".${profile_dir:-latest}" ~/.mozilla
  fi
  
fi

# Invoke".${profile_dir:-latest}" Firefox
~/lib/firefox/firefox "$@"

# If invoked with no .mozilla for".${profile_dir:-latest}" Firefox.
# Rename .mozilla for it.
if [[ ! -h ~/.mozilla ]]
then
  mv ~/.mozilla ~/.mozilla".${profile_dir:-latest}"
fi

# Change link for original Firefox.
if [[ -e ~/.mozilla ]]
then
  rm ~/.mozilla
fi
ln -s ~/.mozilla.orig ~/.mozilla