diff --git a/.m1k1o/build b/.m1k1o/build
index 70f1a00..ec5a987 100755
--- a/.m1k1o/build
+++ b/.m1k1o/build
@@ -55,7 +55,7 @@ build_arm() {
     docker build -t "${BUILD_IMAGE}:arm-base" -f arm-base/Dockerfile "${BASE}"
   else
     # buld ARM image
-    docker build -t "${BUILD_IMAGE}:arm-$1" --build-arg="BASE_IMAGE=${BUILD_IMAGE}:arm-base" -f "$1/Dockerfile" "$1/"
+    docker build -t "${BUILD_IMAGE}:arm-$1" --build-arg="BASE_IMAGE=${BUILD_IMAGE}:arm-base" -f "$1/DockerfileARM" "$1/"
   fi
 }
 
diff --git a/.m1k1o/chromium/Dockerfile b/.m1k1o/chromium/Dockerfile
index a6e7d62..5a1dd1b 100644
--- a/.m1k1o/chromium/Dockerfile
+++ b/.m1k1o/chromium/Dockerfile
@@ -4,13 +4,13 @@ FROM $BASE_IMAGE
 #
 # install neko chromium
 RUN set -eux; apt-get update; \
-    apt-get install -y --no-install-recommends unzip chromium openbox; \
+    apt-get install -y --no-install-recommends unzip chromium-browser openbox; \
     #
     # install widevine module
     WIDEVINE_VERSION=$(wget --quiet -O - https://dl.google.com/widevine-cdm/versions.txt | tail -n 1); \
     wget -O /tmp/widevine.zip "https://dl.google.com/widevine-cdm/$WIDEVINE_VERSION-linux-x64.zip"; \
-    unzip -p /tmp/widevine.zip libwidevinecdm.so > /usr/lib/chromium/libwidevinecdm.so; \
-    chmod 644 /usr/lib/chromium/libwidevinecdm.so; \
+    unzip -p /tmp/widevine.zip libwidevinecdm.so > /usr/lib/chromium-browser/libwidevinecdm.so; \
+    chmod 644 /usr/lib/chromium-browser/libwidevinecdm.so; \
     rm /tmp/widevine.zip; \
     #
     # clean up
diff --git a/.m1k1o/chromium/DockerfileARM b/.m1k1o/chromium/DockerfileARM
new file mode 100644
index 0000000..1d23fc6
--- /dev/null
+++ b/.m1k1o/chromium/DockerfileARM
@@ -0,0 +1,19 @@
+ARG BASE_IMAGE=m1k1o/neko:base
+FROM $BASE_IMAGE
+
+#
+# install neko chromium
+RUN set -eux; apt-get update; \
+    apt-get install -y --no-install-recommends unzip chromium-browser openbox libwidevinecdm0; \
+    #
+    # clean up
+    apt-get --purge autoremove -y unzip; \
+    apt-get clean -y; \
+    rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+
+#
+# copy configuation files
+COPY supervisord.conf /etc/neko/supervisord/chromium.conf
+COPY --chown=neko preferences.json /home/neko/.config/chromium/Default/Preferences
+COPY policies.json /etc/chromium/policies/managed/policies.json
+COPY openbox.xml /etc/neko/openbox.xml
diff --git a/.m1k1o/chromium/supervisord.conf b/.m1k1o/chromium/supervisord.conf
index a972017..635fb03 100644
--- a/.m1k1o/chromium/supervisord.conf
+++ b/.m1k1o/chromium/supervisord.conf
@@ -1,6 +1,6 @@
 [program:chromium]
 environment=HOME="/home/%(ENV_USER)s",USER="%(ENV_USER)s",DISPLAY="%(ENV_DISPLAY)s"
-command=/usr/bin/chromium --window-position=0,0 --display=%(ENV_DISPLAY)s --user-data-dir=/home/neko/.config/chromium --no-first-run --start-maximized --bwsi --force-dark-mode --disable-file-system --disable-gpu --disable-software-rasterizer --disable-dev-shm-usage
+command=/usr/bin/chromium-browser --window-position=0,0 --display=%(ENV_DISPLAY)s --user-data-dir=/home/neko/.config/chromium --no-first-run --start-maximized --bwsi --force-dark-mode --disable-file-system --disable-gpu --disable-software-rasterizer --disable-dev-shm-usage
 autorestart=true
 priority=800
 user=%(ENV_USER)s
diff --git a/.m1k1o/firefox/DockerfileARM b/.m1k1o/firefox/DockerfileARM
new file mode 100644
index 0000000..3ea8b72
--- /dev/null
+++ b/.m1k1o/firefox/DockerfileARM
@@ -0,0 +1,24 @@
+ARG BASE_IMAGE=m1k1o/neko:base
+FROM $BASE_IMAGE
+
+#
+# install firefox-esr
+RUN set -eux; apt-get update; \
+    apt-get install -y --no-install-recommends openbox firefox-esr libwidevinecdm0; \
+    #
+    # install extensions
+    mkdir -p /usr/lib/firefox-esr/distribution/extensions; \
+    wget -O '/usr/lib/firefox-esr/distribution/extensions/uBlock0@raymondhill.net.xpi' https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi; \
+    wget -O /usr/lib/firefox-esr/distribution/extensions/nordvpnproxy@nordvpn.com.xpi https://addons.mozilla.org/firefox/downloads/latest/nordvpn-proxy-extension/latest.xpi; \
+    #
+    # clean up
+    apt-get clean -y; \
+    rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+
+#
+# copy configuation files
+COPY supervisord.conf /etc/neko/supervisord/firefox.conf
+COPY neko.js /usr/lib/firefox-esr/mozilla.cfg
+COPY autoconfig.js /usr/lib/firefox-esr/defaults/pref/autoconfig.js
+COPY policies.json /usr/lib/firefox-esr/distribution/policies.json
+COPY openbox.xml /etc/neko/openbox.xml