make-my-firefox-app.sh

MY=~/Applications/MyFirefoxNightly.app
ORIG=/Applications/FirefoxNightly.app
mkdir -p $MY/Contents/MacOS
mkdir -p $MY/Contents/Resources
cp $ORIG/Contents/Resources/firefox.icns $MY/Contents/Resources
cat <<EOS > $MY/Contents/MacOS/firefox.sh
#!/bin/sh
open -a $ORIG --args -P Nightly -no-remote
EOS
chmod +x $MY/Contents/MacOS/firefox.sh
cat <<EOS > $MY/Contents/Info.plist
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleName</key>
    <string>Nightly</string>
    <key>CFBundleExecutable</key>
    <string>firefox.sh</string>
    <key>CFBundleIconFile</key>
    <string>firefox.icns</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleSignature</key>
    <string>???</string>
</dict>
</plist>
EOS