Optimize build parameters

firefox/firefox.sh

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