diff --git a/.docker/firefox/Dockerfile b/.docker/firefox/Dockerfile
index 7ddc798cd..87332bf74 100644
--- a/.docker/firefox/Dockerfile
+++ b/.docker/firefox/Dockerfile
@@ -7,13 +7,13 @@ ARG SRC_URL="https://download.mozilla.org/?product=firefox-latest&os=linux64&lan
 # install firefox
 RUN set -eux; apt-get update; \
     apt-get install -y --no-install-recommends openbox \
-    xz-utils bzip2 libgtk-3-0 libdbus-glib-1-2; \
+    xz-utils libgtk-3-0 libdbus-glib-1-2; \
     #
     # fetch latest release
-    wget -O /tmp/firefox-setup.tar.bz2 "${SRC_URL}"; \
+    wget -O /tmp/firefox-setup.tar.xz "${SRC_URL}"; \
     mkdir /usr/lib/firefox; \
-    tar -xjf /tmp/firefox-setup.tar.bz2 -C /usr/lib; \
-    rm -f /tmp/firefox-setup.tar.bz2; \
+    tar -xvf /tmp/firefox-setup.tar.xz -C /usr/lib; \
+    rm -f /tmp/firefox-setup.tar.xz; \
     ln -s /usr/lib/firefox/firefox /usr/bin/firefox; \
     #
     # create a profile directory
@@ -21,7 +21,7 @@ RUN set -eux; apt-get update; \
     chown -R neko:neko /home/neko/.mozilla/firefox/profile.default; \
     #
     # clean up
-    apt-get --purge autoremove -y xz-utils bzip2; \
+    apt-get --purge autoremove -y xz-utils; \
     apt-get clean -y; \
     rm -rf /var/lib/apt/lists/* /var/cache/apt/*
 
diff --git a/.docker/firefox/Dockerfile.nvidia b/.docker/firefox/Dockerfile.nvidia
index 0bdc70b74..a43c52795 100644
--- a/.docker/firefox/Dockerfile.nvidia
+++ b/.docker/firefox/Dockerfile.nvidia
@@ -7,13 +7,13 @@ ARG SRC_URL="https://download.mozilla.org/?product=firefox-latest&os=linux64&lan
 # install firefox
 RUN set -eux; apt-get update; \
     apt-get install -y --no-install-recommends openbox \
-    xz-utils bzip2 libgtk-3-0 libdbus-glib-1-2; \
+    xz-utils libgtk-3-0 libdbus-glib-1-2; \
     #
     # fetch latest release
-    wget -O /tmp/firefox-setup.tar.bz2 "${SRC_URL}"; \
+    wget -O /tmp/firefox-setup.tar.xz "${SRC_URL}"; \
     mkdir /usr/lib/firefox; \
-    tar -xjf /tmp/firefox-setup.tar.bz2 -C /usr/lib; \
-    rm -f /tmp/firefox-setup.tar.bz2; \
+    tar -xvf /tmp/firefox-setup.tar.xz -C /usr/lib; \
+    rm -f /tmp/firefox-setup.tar.xz; \
     ln -s /usr/lib/firefox/firefox /usr/bin/firefox; \
     #
     # create a profile directory
@@ -21,7 +21,7 @@ RUN set -eux; apt-get update; \
     chown -R neko:neko /home/neko/.mozilla/firefox/profile.default; \
     #
     # clean up
-    apt-get --purge autoremove -y xz-utils bzip2; \
+    apt-get --purge autoremove -y xz-utils; \
     apt-get clean -y; \
     rm -rf /var/lib/apt/lists/* /var/cache/apt/*