Suppress no sandbox warning

Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-selkies:ubuntunoble
 
 # set version label
@@ -35,6 +37,8 @@ RUN \
   echo 'pref("datareporting.healthreport.uploadEnabled", false);' >> ${FIREFOX_SETTING} && \
   echo 'pref("trailhead.firstrun.branches", "nofirstrun-empty");' >> ${FIREFOX_SETTING} && \
   echo 'pref("browser.aboutwelcome.enabled", false);' >> ${FIREFOX_SETTING} && \
+  echo 'pref("security.sandbox.warn_unprivileged_namespaces", false);' >> ${FIREFOX_SETTING} && \
+  printf "Linuxserver.io version: ${VERSION}\nBuild-date: ${BUILD_DATE}" > /build_version && \
   echo "**** cleanup ****" && \
   apt-get autoclean && \
   rm -rf \

Dockerfile.aarch64

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-selkies:arm64v8-ubuntunoble
 
 # set version label
@@ -35,6 +37,8 @@ RUN \
   echo 'pref("datareporting.healthreport.uploadEnabled", false);' >> ${FIREFOX_SETTING} && \
   echo 'pref("trailhead.firstrun.branches", "nofirstrun-empty");' >> ${FIREFOX_SETTING} && \
   echo 'pref("browser.aboutwelcome.enabled", false);' >> ${FIREFOX_SETTING} && \
+  echo 'pref("security.sandbox.warn_unprivileged_namespaces", false);' >> ${FIREFOX_SETTING} && \
+  printf "Linuxserver.io version: ${VERSION}\nBuild-date: ${BUILD_DATE}" > /build_version && \
   echo "**** cleanup ****" && \
   apt-get autoclean && \
   rm -rf \

README.md

@@ -441,6 +441,7 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **26.08.25:** - Suppress sandbox security warning as it's misleading inside a container.
 * **16.08.25:** - Add proper cleanup logic for builds.
 * **01.07.25:** - Add Kasm branch.
 * **23.06.25:** - Rebase to Selkies, HTTPS is now required.

jenkins-vars.yml

@@ -7,7 +7,6 @@ custom_version_command: "curl -s -L https://ppa.launchpadcontent.net/xtradeb/app
 release_type: stable
 release_tag: latest
 ls_branch: master
-build_armhf: false
 repo_vars:
   - BUILD_VERSION_ARG = 'FIREFOX_VERSION'
   - LS_USER = 'linuxserver'

readme-vars.yml

@@ -115,6 +115,7 @@ init_diagram: |
   "firefox:latest" <- Base Images
 # changelog
 changelogs:
+  - {date: "26.08.25:", desc: "Suppress sandbox security warning as it's misleading inside a container."}
   - {date: "16.08.25:", desc: "Add proper cleanup logic for builds."}
   - {date: "01.07.25:", desc: "Add Kasm branch."}
   - {date: "23.06.25:", desc: "Rebase to Selkies, HTTPS is now required."}

root/defaults/autostart

@@ -1 +1,3 @@
-firefox ${FIREFOX_CLI}
+#!/bin/bash
+
+/usr/bin/firefox ${FIREFOX_CLI}