Configure firefox profile with bash cli

configure_firefox.sh

#!/usr/bin/env bash
set -o errexit
set -o pipefail
set -o nounset
# set -o xtrace

if [ -d "${HOME}/.mozilla/firefox" ]; then
    FIREFOX_PROFILES="${HOME}/.mozilla/firefox"
elif [ -d "${HOME}/snap/firefox/common/.mozilla/firefox" ]; then
    FIREFOX_PROFILES="${HOME}/snap/firefox/common/.mozilla/firefox"
fi

PROFILES_INI="${FIREFOX_PROFILES}/profiles.ini"

if grep -q '\[Profile[^0]\]' "${PROFILES_INI}"; then
    PROFILE_PATH=$(grep -E '^\[Profile|^Path|^Default' "${PROFILES_INI}" | grep -1 '^Default=1' | grep '^Path' | cut -c6-)
else
    PROFILE_PATH=$(grep 'Path=' "${PROFILES_INI}" | sed 's/^Path=//')
fi

PROFILE_PATH="${FIREFOX_PROFILES}/${PROFILE_PATH}"
USER_PREFS="${PROFILE_PATH}/prefs.js"
touch "${USER_PREFS}"

cat << 'EOF' >> "${USER_PREFS}"
# don't trim URLs
user_pref("browser.urlbar.trimURLs", "false"); 
EOF