## Dockerfile
cat >Dockerfile <<- 'Dockerfile'
# syntax = docker/dockerfile:1.2
FROM myvnc/i3:base
USER root

# # ENV variables
# ENV MYVNC_FIREFOX_URL   # optional
# ENV MYVNC_FIREFOX_OPTS  # eg, --kiosk
 
# Install packages
RUN --mount=type=cache,sharing=locked,target=/var/cache/pacman \
    pacman -Syu --ask 4 --needed \
    firefox firefox-decentraleyes firefox-ublock-origin \
    && pacman -Scc --ask 4

# Tigervnc
COPY 20-firefox.sh /app/init.d/
RUN chmod +x /app/init.d/*

# Reset user home directory
USER user
WORKDIR /home/user
Dockerfile

## Firefox setup
cat >20-firefox.sh <<- 'entrypoint'
#!/usr/bin/env bash
# Create firefox profile directory
mkdir -p /app/firefox

# Firefox custom user.js
cat >/app/firefox/user.js <<- 'firefox'
// First run
user_pref("app.normandy.first_run", false);
user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);
user_pref("trailhead.firstrun.didSeeAboutWelcome", true);
user_pref("browser.startup.homepage_override.mstone", "ignore");

// Homepage
// user_pref("browser.startup.page", 1);
// user_pref("browser.startup.homepage", "https://myvelabs.app/");

// Security/privacy section
user_pref("app.shield.optoutstudies.enabled", false);
user_pref("browser.contentblocking.category", "standard");
user_pref("datareporting.healthreport.uploadEnabled", false);
user_pref("extensions.pocket.enabled", false);
user_pref("dom.private-attribution.submission.enabled", false);
user_pref("network.trr.mode", 5);

// Disable sponsored content on Firefox Home (Activity Stream)
user_pref("browser.newtabpage.activity-stream.showSearch", false);
user_pref("browser.newtabpage.activity-stream.showSponsored", false);
user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false);
user_pref("browser.newtabpage.activity-stream.default.sites", "");
user_pref("browser.newtabpage.activity-stream.topSitesRows", 4);

// Disable about:config warning
user_pref("browser.aboutConfig.showWarning", false);

// Disable url autocomplete
user_pref("browser.search.suggest.enabled", false);
user_pref("browser.urlbar.suggest.recentsearches", false);
user_pref("browser.urlbar.suggest.searches", false);

// Closing firefox properties
user_pref("browser.warnOnQuitShortcut", false);
user_pref("browser.tabs.closeWindowWithLastTab", false);

// Disable autohide toolbar on fullscreen
user_pref("browser.fullscreen.autohide", false);
firefox

# # i3/firefox config
# cat >~/.config/i3/config.d/firefox.conf <<- 'firefox'
# # Maximize
# for_window [class="firefox"] fullscreen enable
# firefox

# i3/firefox startup
install /dev/stdin ~/.config/i3/startapp.sh <<- startup
#!/usr/bin/env bash
# Run firefox
while true
do
    /usr/bin/firefox --profile /app/firefox ${MYVNC_FIREFOX_OPTS} --new-window ${MYVNC_FIREFOX_URL}
done
startup
entrypoint

## Docker build
DOCKER_BUILDKIT=1 docker build ./. \
    --tag myvnc/firefox \
    && rm -f Dockerfile *.sh