Disable the privacy notice page on first start.

rootfs/defaults/prefs.js

@@ -0,0 +1,2 @@
+// Disable the privacy notice page.
+user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);

rootfs/etc/cont-init.d/55-firefox.sh

@@ -6,6 +6,7 @@ set -u # Treat unset variables as an error.
 # Make sure some directories are created.
 mkdir -p /config/downloads
 mkdir -p /config/log/firefox
+mkdir -p /config/profile
 
 # Generate machine id.
 if [ ! -f /etc/machine-id ]; then
@@ -13,6 +14,9 @@ if [ ! -f /etc/machine-id ]; then
     cat /proc/sys/kernel/random/uuid | tr -d '-' > /etc/machine-id
 fi
 
+# Copy default preferences.
+[ -f /config/profile/prefs.js ] || cp /defaults/prefs.js /config/profile/prefs.js
+
 # Verify the size of /dev/shm.
 SHM_SIZE_MB="$(df -m /dev/shm | tail -n 1 | tr -s ' ' | cut -d ' ' -f2)"
 if [ "$SHM_SIZE_MB" -eq 64 ]; then

rootfs/startapp.sh

@@ -4,6 +4,6 @@ set -e # Exit immediately if a command exits with a non-zero status.
 set -u # Treat unset variables as an error.
 
 export HOME=/config
-mkdir -p /config/profile
+
 /usr/bin/firefox --version
 exec /usr/bin/firefox  --profile /config/profile --setDefaultBrowser >> /config/log/firefox/output.log 2>> /config/log/firefox/error.log