diff --git a/Dockerfile b/Dockerfile
index 3e59353..9a0ea4d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,7 +22,6 @@ RUN \
   fi && \
   apk add --no-cache \
     firefox==${FIREFOX_VERSION} && \
-  sed -i 's|</applications>|  <application title="Mozilla Firefox" type="normal">\n    <maximized>yes</maximized>\n  </application>\n</applications>|' /etc/xdg/openbox/rc.xml && \
   echo "**** default firefox settings ****" && \
   FIREFOX_SETTING="/usr/lib/firefox/browser/defaults/preferences/firefox.js" && \
   echo 'pref("datareporting.policy.firstRunURL", "");' > ${FIREFOX_SETTING} && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 6f862b2..43f98cb 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -22,7 +22,6 @@ RUN \
   fi && \
   apk add --no-cache \
     firefox==${FIREFOX_VERSION} && \
-  sed -i 's|</applications>|  <application title="Mozilla Firefox" type="normal">\n    <maximized>yes</maximized>\n  </application>\n</applications>|' /etc/xdg/openbox/rc.xml && \
   echo "**** default firefox settings ****" && \
   FIREFOX_SETTING="/usr/lib/firefox/browser/defaults/preferences/firefox.js" && \
   echo 'pref("datareporting.policy.firstRunURL", "");' > ${FIREFOX_SETTING} && \