diff --git a/NodeBase/Dockerfile.txt b/NodeBase/Dockerfile.txt
index f4f7763747..48b5efa058 100644
--- a/NodeBase/Dockerfile.txt
+++ b/NodeBase/Dockerfile.txt
@@ -88,6 +88,7 @@ COPY selenium.conf /etc/supervisor/conf.d/
 ENV SCREEN_WIDTH 1360
 ENV SCREEN_HEIGHT 1020
 ENV SCREEN_DEPTH 24
+ENV SCREEN_DPI 96
 ENV DISPLAY :99.0
 ENV START_XVFB true
 
diff --git a/NodeBase/start-xvfb.sh b/NodeBase/start-xvfb.sh
index ed0fe9ef6d..4d2ed0f2ce 100755
--- a/NodeBase/start-xvfb.sh
+++ b/NodeBase/start-xvfb.sh
@@ -5,7 +5,7 @@ if [ "${START_XVFB}" = true ] ; then
 
   rm -f /tmp/.X*lock
 
-  /usr/bin/Xvfb ${DISPLAY} -screen 0 ${GEOMETRY} -ac +extension RANDR
+  /usr/bin/Xvfb ${DISPLAY} -screen 0 ${GEOMETRY} -dpi ${SCREEN_DPI} -ac +extension RANDR
 else
   echo "Xvfb won't start. Chrome/Firefox can only run in headless mode. Remember to set the 'headless' flag in your test."
 fi
diff --git a/README.md b/README.md
index 957e086cc5..30d11606e6 100644
--- a/README.md
+++ b/README.md
@@ -253,10 +253,10 @@ $ docker run -d -p <node_port>:5555 -e HUB_HOST=<hub_ip|hub_name> -e HUB_PORT=44
 
 ### Setting Screen Resolution
 
-By default, nodes start with a screen resolution of 1360 x 1020 with a color depth of 24 bits.  These settings can be adjusted by specifying `SCREEN_WIDTH`, `SCREEN_HEIGHT` and/or `SCREEN_DEPTH` environmental variables when starting the container.
+By default, nodes start with a screen resolution of 1360 x 1020 with a color depth of 24 bits and a dpi of 96. These settings can be adjusted by specifying `SCREEN_WIDTH`, `SCREEN_HEIGHT`, `SCREEN_DEPTH`, and/or `SCREEN_DPI` environmental variables when starting the container.
 
 ``` bash
-docker run -d -e SCREEN_WIDTH=1366 -e SCREEN_HEIGHT=768 -e SCREEN_DEPTH=24 selenium/standalone-firefox
+docker run -d -e SCREEN_WIDTH=1366 -e SCREEN_HEIGHT=768 -e SCREEN_DEPTH=24 -e SCREEN_DPI=74 selenium/standalone-firefox
 ```
 
 Bear in mind that in non-debug images, the maximize window command won't work. You can use the resize window command