diff --git a/Dockerfile b/Dockerfile
index 3f31254..fadfa26 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,8 +2,6 @@ FROM ubuntu:16.04
 
 MAINTAINER Tomohisa Kusano <siomiz@gmail.com>
 
-ENV CHROME_REMOTE_DESKTOP_DEFAULT_DESKTOP_SIZES 1024x768
-
 COPY copyables /
 
 ADD https://dl.google.com/linux/linux_signing_key.pub /tmp/
@@ -18,15 +16,24 @@ RUN apt-key add /tmp/linux_signing_key.pub \
 	pulseaudio \
 	supervisor \
 	x11vnc \
+	fluxbox \
 	&& dpkg -i /tmp/libgcrypt11_*.deb \
 	&& apt-get clean \
-	&& rm -rf /var/cache/* /var/log/apt/* /tmp/* \
+	&& rm -rf /var/cache/* /var/log/apt/* /var/lib/apt/lists/* /tmp/* \
 	&& addgroup chrome-remote-desktop \
 	&& useradd -m -G chrome-remote-desktop,pulse-access chrome \
 	&& ln -s /crdonly /usr/local/sbin/crdonly \
 	&& ln -s /update /usr/local/sbin/update \
 	&& mkdir -p /home/chrome/.config/chrome-remote-desktop \
-	&& chown -R chrome:chrome /home/chrome/.config
+	&& chown -R chrome:chrome /home/chrome/.config \
+	&& mkdir -p /home/chrome/.fluxbox \
+	&& echo $' \n\
+		session.screen0.defaultDeco: NONE \n\
+		session.screen0.toolbar.visible: NONE \n\
+		session.screen0.fullMaximization: true \n\
+		session.screen0.maxDisableResize: true \n\
+		session.screen0.maxDisableMove: true \n\
+	' >> /home/chrome/.fluxbox/init
 
 VOLUME ["/home/chrome"]
 
diff --git a/README.md b/README.md
index 50552c6..707d44f 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,11 @@
- - Screen size is currently hardcoded as 1024x768.
- - A testing branch for [RandR](https://en.wikipedia.org/wiki/RandR) (i.e. "Resize desktop to fit" in CRD client) is available; Use Docker image tag **:randr**.
+ - The testing branch for [RandR](https://en.wikipedia.org/wiki/RandR) (i.e. "Resize desktop to fit" in CRD client) is merged into master/latest.
 
 Google Chrome via VNC
 ==
 `docker run -p 127.0.0.1:5900:5900 siomiz/chrome`
 
  - Google Chrome, not Chromium, for the ease of Flash plugin management
- - on Xvfb
+ - on Xvfb, with FluxBox (no window decorations)
  - served by X11VNC (no password; assuming usage via SSH)
 
 Must agree to [Google Chrome ToS][1] to use.
@@ -16,11 +15,9 @@ Google Chrome via Chrome Remote Desktop
 ... so you can use the full Google Chrome with Flash on iPad (with preliminary sound support)!
 Much faster than VNC thanks to VP8!
 
-No "desktop"; session goes straight to a maximized chrome.
-
 Prerequisite: Create a Profile Volume
 --
-You need a VNC client for the initial setup. 
+You need a VNC client for the initial setup.
 
  1. `docker run -d --name chrome-profile siomiz/chrome` (NO password so DO NOT simply use -p 5900:5900 to expose it to the world!)
  2. Connect to the container via VNC. Find the container's IP address by `docker inspect -f '{{ .NetworkSettings.IPAddress }}' chrome-profile`
@@ -34,8 +31,6 @@ Usage
 `docker run -d --volumes-from chrome-profile siomiz/chrome /crdonly` (no port needs to be exposed)
 `/crdonly` command will run chrome-remote-desktop in foreground.
 
-On first connection (and after an "unclean" container stop) you will get a "Profile Locked / owned by different process" dialog, which you can just select "Relaunch".
-
 Docker ホスト(ヘッドレス可！)で走らせれば、「艦これ」等 Flash ブラウザゲームを iPad/iPhone/Android 等上の Chrome リモート デスクトップ アプリで一応プレイ可能になります。サウンド付き(遅延があります)。
 Chrome は英語版ですが、Web ページ用の日本語フォントは含まれています。[詳しくはこちら。][3]
 
diff --git a/copyables/crd-session b/copyables/crd-session
index 156f609..cfd042e 100644
--- a/copyables/crd-session
+++ b/copyables/crd-session
@@ -1 +1,2 @@
+rm -rf /home/chrome/.config/chrome-remote-desktop/chrome-profile/Singleton*
 exec /opt/google/chrome/chrome --no-sandbox --window-position=0,0 --window-size=1024,768 --force-device-scale-factor=1
diff --git a/copyables/etc/supervisor/conf.d/supervisord-crdonly.conf b/copyables/etc/supervisor/conf.d/supervisord-crdonly.conf
index d16d5ec..28fd2f2 100644
--- a/copyables/etc/supervisor/conf.d/supervisord-crdonly.conf
+++ b/copyables/etc/supervisor/conf.d/supervisord-crdonly.conf
@@ -2,8 +2,15 @@
 nodaemon=true
 
 [program:crd]
-environment=HOME="/home/chrome",USER="chrome",CHROME_REMOTE_DESKTOP_DEFAULT_DESKTOP_SIZES="1024x768"
+environment=HOME="/home/chrome",USER="chrome"
 command=/usr/bin/python /opt/google/chrome-remote-desktop/chrome-remote-desktop --start --foreground --config=/home/chrome/.config/chrome-remote-desktop/~host.json
 user=chrome
 autorestart=true
 priority=200
+
+[program:fluxbox]
+environment=DISPLAY=":20",HOME="/home/chrome",USER="chrome",XAUTHORITY="/home/chrome/.Xauthority"
+command=/usr/bin/fluxbox
+user=chrome
+autorestart=true
+startretries=60
diff --git a/copyables/usr/bin/Xvfb-randr b/copyables/usr/bin/Xvfb-randr
deleted file mode 100755
index c2e242c..0000000
Binary files a/copyables/usr/bin/Xvfb-randr and /dev/null differ