diff --git a/background.js b/background.js
index f70fd09..7b65bc2 100644
--- a/background.js
+++ b/background.js
@@ -7,7 +7,7 @@ chrome.app.runtime.onLaunched.addListener(function() {
         id: "BlocklyProp-Launcher",
         innerBounds: {
             width: 500,
-            height: 414
+            height: 433
         }, state: "normal",
         resizable: false
     }, function(win) {
diff --git a/package/mac_app_sign_and_package.sh b/package/mac_app_sign_and_package.sh
index 837d297..030839b 100755
--- a/package/mac_app_sign_and_package.sh
+++ b/package/mac_app_sign_and_package.sh
@@ -471,6 +471,7 @@ if [[ -e ${RESOURCES}${DIST_DST} ]]
 then
     echo "Cleaning up temporary files..."   
     rm ${RESOURCES}${DIST_DST}
+    rm ${DISTRIBUTION}${APP_NAME}.pkg
 fi
 
 echo
diff --git a/package/mac_app_sign_and_package_12.1-.sh b/package/mac_app_sign_and_package_12.1-.sh
new file mode 100755
index 0000000..2ad17e6
--- /dev/null
+++ b/package/mac_app_sign_and_package_12.1-.sh
@@ -0,0 +1,486 @@
+#!/bin/sh --
+#
+# This script signs and packages a Mac OS X application bundle.
+# The final package will be created as ../dist/|APP_NAME|-|VERSION|-setup-MacOS.pkg.
+#
+# Requirements for this script are:
+#
+#   User must specify the application bundle name without extension: (example -a "MyApplication")
+#     IMPORTANT: Application bundle must exist in folder noted below
+#   User must specify the package version: (example: "-v 1.0.56")
+#   
+#   All other parameters are optional: (FTDI driver installer, restart requirement, developer identities)
+#
+#   These files and folders must exist in the paths show below (in relation to this script's folder):
+#      ./drivers/FTDIUSBSerialDriver.kext
+#      ./mac-resources/neededToRun.entitlements
+#      ../dist/|application_bundle_name|.app
+#
+#   To update the driver, 
+#      - download and install driver (from http://www.ftdichip.com/Drivers/VCP.htm)
+#        - select the currently supported Mac OS X VCP driver from that page (i.e. x64 (64-bit))
+#        - or use: http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_4.2.dmg
+#        - install FTDI's driver package onto the development Mac OS X system
+#      - copy the FTDIUSBSerialDriver.kext from /Library/Extensions/ to the ../drivers/ folder
+#
+#   The ../dist/|application_bundle_name|.app will be modified by this script to digitally sign it with the default or optional
+#       application developer identity certificate as well as with the given runtime entitlements (neededToRun.entitlements)
+#
+
+usage()
+{
+cat << EOF
+Usage: $0 OPTIONS
+
+This script signs an application bundle and builds a signed installation package.
+
+OPTIONS:
+    -h  show usage
+    -a  (REQUIRED) application bundle name
+        - example: -a "MyApplication"
+    -v  (REQUIRED) version
+        - example: -v 0.5.1
+    -r  require restart after installation (applies only if FTDIUSBSerialDriver is included)
+    -f  include FTDIUSBSerialDriver in the package
+    -s  application developer identity certificate key
+        - example: -s "Developer Identity" (default is "Developer ID Application")
+    -t  installer developer identity certificate key
+        - example: -t "Developer Identity" (default is "Developer ID Installer")
+    -d  use deployment identifier (default is: com.test.ParallaxInc, deploy is: com.ParallaxInc.|APP_NAME|)
+
+    examples: $0 -a "MyApplication" -v 1.0.56 -d
+              $0 —a "MyApplication" -v 1.0.56 -r -f -s "Developer ID Application" -t "Developer ID Installer" -d
+
+EOF
+}
+
+#
+# Resource paths
+#
+# Notes: 
+#   * All are paths relative to this script.
+#   * NWJS_FW_LIBRARIES (NW.js Framework Libraries) is the path inside of APP_BUNDLE (defined later)
+#
+RESOURCES="./mac-resources/"
+DISTRIBUTION="../dist/"
+NWJS_FW="/Contents/Frameworks/nwjs Framework.framework/"
+NWJS_FW_LIBRARIES="${NWJS_FW}Versions/Current/Libraries/"
+ENTITLEMENTS="${RESOURCES}neededToRun.entitlements"
+
+#
+# Default installation locations
+#
+# Note: the FTDI kext used to be in "/System/Library/Extensions/" per Apple's previous suggestion (before Mavericks?)
+#
+FTDIDRIVER_DEST_DIR="/Library/Extensions/"
+DEFAULT_APP_DIR="/Applications/"
+
+#
+# Default component names
+#
+FTDIDRIVER=FTDIUSBSerialDriver
+FTDIDRIVER_KEXT=${FTDIDRIVER}.kext
+
+#
+# Modified temporary distro xml
+#
+# Note: will contain copied or sed-modified version of template DistributionXXXX.xml
+#
+DIST_DST=DistributionMOD.xml
+
+#
+# initialize input options with default values
+#
+APP_NAME=
+VERSION=
+APP_IDENTITY="Developer ID Application"
+INST_IDENTITY="Developer ID Installer"
+REQUIRE_RESTART_TEXT="requireRestart"
+RESTART=false
+DEPLOY=false
+FTDI=false
+
+#
+# get parms as flags or as requiring arguments
+#
+while getopts "ha:v:rfs:t:d" OPTION
+do
+    case $OPTION in
+        h)
+            usage; exit 1 ;;
+        a)
+            APP_NAME=$OPTARG
+            ;;           
+        v)
+            VERSION=$OPTARG
+            ;;
+        r)
+            if [[ $OPTARG =~ ^[0-9]+$ ]]
+            then
+                RESTART=$OPTARG
+            elif [[ $OPTARG =~ ^-, ]]
+            then
+                RESTART=true
+                let OPTIND=$OPTIND-1
+            else
+                RESTART=true
+            fi
+            ;;
+        f)
+            if [[ $OPTARG =~ ^[0-9]+$ ]]
+            then
+                FTDI=$OPTARG
+            elif [[ $OPTARG =~ ^-, ]]
+            then
+                FTDI=true
+                let OPTIND=$OPTIND-1
+            else
+                FTDI=true
+            fi
+            ;;
+        s)
+            APP_IDENTITY=$OPTARG
+            ;;
+        t)
+            INST_IDENTITY=$OPTARG
+            ;;
+        d)
+            if [[ $OPTARG =~ ^[0-9]+$ ]]
+            then
+                DEPLOY=$OPTARG
+            elif [[ $OPTARG =~ ^-, ]]
+            then
+                DEPLOY=true
+                let OPTIND=$OPTIND-1
+            else
+                DEPLOY=true
+            fi
+            ;;
+        ?)
+            echo "[HALT] Misconfigured options - see usage notes"
+            usage; exit  ;;
+    esac
+done
+
+#
+# Error if no application bundle name (-a bundle) was declared
+#
+if [[ -z $APP_NAME ]]
+then
+    echo "[HALT] No application bundle was declared - see usage notes for -a."
+    echo
+    usage
+    exit 1
+fi
+
+#
+# Set bundle name
+#
+APP_BUNDLE=${APP_NAME}.app
+
+#
+# Error if no version (-v) option declared
+#
+if [[ -z $VERSION ]]
+then
+    echo "[HALT] No version option was declared - see usage notes for -v."
+    echo
+    usage
+    exit 1
+fi
+
+#
+# Error if no version string declared
+#
+if [ ${VERSION}X == X ]
+then
+    echo "[HALT] No version string was declared - see usage notes for -v."
+    echo
+    usage
+    exit 1
+fi
+
+#
+# Show Info
+#
+echo
+echo "----------------RECIPE----------------"
+echo "* Processing target: \"${DISTRIBUTION}${APP_NAME}.app\""
+echo "* As build version: \"${VERSION}\""
+echo "* Using application identity: \"${APP_IDENTITY}\""
+echo "* Using installer identity: \"${INST_IDENTITY}\""
+if [[ $RESTART == true ]]
+then
+    echo "* Restart required after installation"
+else
+    echo "* Restart NOT required after installation"
+fi
+if [[ ${FTDI} == true ]]
+then
+    echo "* FTDI kext WILL BE installed by this package"
+else
+    echo "* FTDI kext WILL NOT BE installed by this package"
+fi
+
+echo
+
+#
+# Use security utility to determine if the developer installation identity is valid
+#
+echo "Validating developer identity certificates..."
+APP_SECUREID=`security find-certificate -c "$APP_IDENTITY" | grep labl`
+INST_SECUREID=`security find-certificate -c "$INST_IDENTITY" | grep labl`
+if [[ -n ${APP_SECUREID} ]]
+then
+    echo "  Found Application Identity: \"${APP_IDENTITY}\""
+else
+    echo "  [Error] Application Identity: \"${APP_IDENTITY}\" does not exist!"
+    echo "          Use Keychain Access app to verify that you are using an authorized developer installation certificate..."
+    echo "          i.e. search within Login Keychain 'My Certificates' Category for certificate, for example: 'Developer ID Application'"
+    echo
+    exit 1
+fi
+if [[ -n ${INST_SECUREID} ]]
+then
+    echo "  Found Installer Identity: \"${INST_IDENTITY}\""
+else
+    echo "  [Error] Installer Identity: \"${INST_IDENTITY}\" does not exist!"
+    echo "          Use Keychain Access app to verify that you are using an authorized developer installation certificate..."
+    echo "          i.e. search within Login Keychain 'My Certificates' Category for certificate, for example: 'Developer ID Installer'."
+    echo
+    exit 1
+fi
+
+echo
+
+#
+# Set bundle version number (in Info.plist)
+#
+if [[ -e "${DISTRIBUTION}${APP_BUNDLE}" ]]
+then
+    if [[ -e "${DISTRIBUTION}${APP_BUNDLE}/Contents/Info.plist" ]]
+    then
+        if sed -i.bak s_\<string\>0.0.0\<\/string\>_\<string\>${VERSION}\<\/string\>_ "${DISTRIBUTION}${APP_BUNDLE}/Contents/Info.plist"
+        then
+            echo "Set bundle's Info.plist to version: \"${VERSION}\""
+            rm "${DISTRIBUTION}${APP_BUNDLE}/Contents/Info.plist.bak"
+        else
+            echo "[Error] Could not set bundle's version in Info.plist."
+            exit 1
+        fi
+    else
+        echo "[Error] Application bundle does not include an Info.plist file."
+        exit 1
+    fi
+else
+    echo "[Error] Application bundle not found: ${DISTRIBUTION}${APP_BUNDLE}"
+    exit 1
+fi
+
+echo
+
+#
+# Attempt to deeply codesign the known-to-be-unsigned nwjs libraries and nwjs framework
+#
+echo "Code signing nwjs libraries and framework within the application bundle: ${DISTRIBUTION}${APP_BUNDLE} with identity: \"${APP_IDENTITY}\""
+#
+# signing libEGL.dylib
+#
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}${NWJS_FW_LIBRARIES}libEGL.dylib"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing nwjs library failed!" 1>&2
+    exit 1
+fi
+#
+# libGLESv2.dylib
+#
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}${NWJS_FW_LIBRARIES}libGLESv2.dylib"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing nwjs library failed!" 1>&2
+    exit 1
+fi
+#
+# libswiftshader_libEGL.dylib
+#
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}${NWJS_FW_LIBRARIES}libswiftshader_libEGL.dylib"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing nwjs library failed!" 1>&2
+    exit 1
+fi
+#
+# libswiftshader_libGLESv2.dylib
+#
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}${NWJS_FW_LIBRARIES}libswiftshader_libGLESv2.dylib"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing nwjs library failed!" 1>&2
+    exit 1
+fi
+#
+# nwjs Framework
+#
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}${NWJS_FW}nwjs Framework"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing nwjs framework failed!" 1>&2
+    exit 1
+fi
+
+
+echo
+
+#
+# Attempt to deeply codesign the app bundle
+#
+echo "Code signing the application bundle (hardened runtime with entitlements): ${DISTRIBUTION}${APP_BUNDLE} with identity: \"${APP_IDENTITY}\""
+codesign -s "$APP_IDENTITY" --deep -f -v --options runtime --timestamp --entitlements "${ENTITLEMENTS}" "${DISTRIBUTION}${APP_BUNDLE}"
+if [ "$?" != "0" ]; then
+    echo "[Error] Code signing the application bundle failed!" 1>&2
+    exit 1
+fi
+
+echo
+
+#
+# Verify that app is code-signed
+# A properly signed app will contain a _CodeSignature directory and CodeResource file
+#
+echo "Validating application signature..."
+if [[ -e "${DISTRIBUTION}${APP_BUNDLE}" ]]
+then
+    #
+    # Found bundle
+    #
+    if [[ -e "${DISTRIBUTION}${APP_BUNDLE}/Contents/_CodeSignature/CodeResources" ]]
+    then
+        #
+        # Found code signature, now we'll check validity
+        # A single "-v" == "verify app signing", gives no result on valid app signing 
+        #
+        codesign -v "${DISTRIBUTION}${APP_BUNDLE}"
+        if [ "$?" != "0" ]; then
+            echo "  [Error] Application signature is invalid!" 1>&2
+            exit 1
+        else
+            echo "  Verified ${DISTRIBUTION}${APP_BUNDLE} signature"
+        fi
+    else
+        echo "  [Error] Application bundle is not signed."
+        exit 1
+    fi
+fi
+
+echo
+
+#
+# Developer PARALLAX_IDENTIFIER & FTDI_IDENTIFIER (package can be for testing or deployment)
+#
+if [[ $DEPLOY == true ]]
+then
+    PARALLAX_IDENTIFIER=com.ParallaxInc
+    #   Will get modified to: "com.ParallaxInc.|APP_NAME|" below
+    FTDI_IDENTIFIER=com.FTDI.driver
+    #   Will get modified to: "com.FTDI.driver.FTDIUSBSerialDriver" below
+    echo "Package’s CFBundleIdentifiers will be set for deployment"
+else
+    PARALLAX_IDENTIFIER=com.test.ParallaxInc
+    #   Will get modified to: "com.test.ParallaxInc.|APP_NAME|" below
+    FTDI_IDENTIFIER=com.test.FTDI.driver
+    #   Will get modified to: "com.test.FTDI.driver.FTDIUSBSerialDriver" below
+    echo "Package’s CFBundleIdentifiers will be set for testing"
+fi
+
+#
+# touch the entire bundle directory to set most-recent mod dates
+#
+touch ${DISTRIBUTION}*
+
+#
+# If necessary, build the FTDIUSBSerialDriver.kext component package
+#
+if [[ ${FTDI} == true ]]
+then
+#   is the FTDI Driver kext available?
+    if [[ -e ./drivers/${FTDIDRIVER_KEXT} ]]
+    then
+        echo; echo "Found FTDI USB Serial Driver kext"
+        DIST_SRC=DistributionFTDI.xml
+#
+#       build the FTDI Driver component package
+        echo; echo "Building FTDI USB Driver package..."
+        pkgbuild    --root ./drivers/${FTDIDRIVER_KEXT} \
+                    --identifier ${FTDI_IDENTIFIER}.${FTDIDRIVER} \
+                    --timestamp \
+                    --install-location ${FTDIDRIVER_DEST_DIR}${FTDIDRIVER_KEXT} \
+                    --sign "$INST_IDENTITY" \
+                    --version ${VERSION} \
+                    ${DISTRIBUTION}FTDIUSBSerialDriver.pkg
+    else
+        echo "[Error] FTDI USB Serial Driver kext is missing. Please read $0 comments."
+        exit 1
+    fi
+else
+    DIST_SRC=Distribution.xml
+fi
+
+echo
+
+#
+# Build the application component package
+#
+echo "Building application package..."
+pkgbuild --root "${DISTRIBUTION}${APP_BUNDLE}" \
+         --identifier "${PARALLAX_IDENTIFIER}.${APP_NAME}" \
+         --timestamp \
+         --install-location "${DEFAULT_APP_DIR}${APP_BUNDLE}" \
+         --sign "$INST_IDENTITY" \
+         --version ${VERSION} \
+         "${DISTRIBUTION}${APP_NAME}.pkg"
+
+#
+# Write a synthesized distribution xml directly (NO LONGER USED, BUT CAN PROVIDE A DISTRIBUTION XML FILE AS A TEMPLATE)
+#
+#productbuild --synthesize --sign "$INST_IDENTITY" --timestamp=none --package "${DISTRIBUTION}${APP_NAME}.pkg" --package ${DISTRIBUTION}FTDIUSBSerialDriver.pkg ${RESOURCES}${DIST_SRC}
+#
+
+#
+# Modify the existing DistributionXXXX.xml only if requiredRestart is requested
+#
+if [[ ${FTDI} == true ]]
+then
+    if [[ ${RESTART} == true ]]
+    then
+	echo; echo "Modifying distribution xml to require restart..."
+        sed "s/\"none\"\>FTDI/\"${REQUIRE_RESTART_TEXT}\"\>FTDI/g" ${RESOURCES}${DIST_SRC} > ${RESOURCES}${DIST_DST}
+    else
+        cat ${RESOURCES}${DIST_SRC} > ${RESOURCES}${DIST_DST}
+    fi
+else
+    cat ${RESOURCES}${DIST_SRC} > ${RESOURCES}${DIST_DST}
+fi
+
+echo 
+
+#
+# Build the Product Installation Package
+#
+# note: $DIST_DST holds a copied or modified version of one of the 2 DistributionXXXX.xml files
+#       The $DIST_DST contains installation options & links to resources for the product package
+echo "Building installation package..."
+productbuild    --distribution ${RESOURCES}${DIST_DST} \
+                --resources ${RESOURCES} \
+                --timestamp \
+                --version $VERSION \
+                --package-path ${DISTRIBUTION} \
+                --sign "$INST_IDENTITY" \
+                "${DISTRIBUTION}${APP_NAME}-${VERSION}-setup-MacOS.pkg"
+
+echo
+
+if [[ -e ${RESOURCES}${DIST_DST} ]]
+then
+    echo "Cleaning up temporary files..."   
+    rm ${RESOURCES}${DIST_DST}
+fi
+
+echo
+echo "Done!"
+exit 0