Makes Firefox.app open a version-specific profile so you can run multiple versions at the same time

gistfile2.txt

multi-firefox.sh

#!/bin/bash

FIREFOX_APP=${1:-/Applications/Firefox.app}
[[ ! -d "$FIREFOX_APP" ]] && { echo "Could not find Firefox"; exit 1; }

FIREFOX_BIN="$FIREFOX_APP/Contents/MacOS/firefox-bin"
[[ ! -f "$FIREFOX_BIN" ]] && { echo "Can't find executable"; exit 1; }

FIREFOX_VERSION=`defaults read "$FIREFOX_APP/Contents/Info" CFBundleVersion | cut -d . -f 1,2`

FIREFOX_PROFILE="Firefox$FIREFOX_VERSION"

"$FIREFOX_BIN" -CreateProfile "$FIREFOX_PROFILE"

FIREFOX_LAUNCHER="$FIREFOX_APP/Contents/MacOS/multi-firefox-bin"

cat > "$FIREFOX_LAUNCHER" <<EOF
#!/bin/bash
"$FIREFOX_BIN" -P "$FIREFOX_PROFILE" -no-remote
EOF
chmod +x "$FIREFOX_LAUNCHER"

defaults write "$FIREFOX_APP/Contents/Info" \
  CFBundleExecutable -string multi-firefox-bin

defaults write "$FIREFOX_APP/Contents/Info" \
  CFBundleIdentifier -string "org.mozilla.firefox.$FIREFOX_VERSION"

# Apparently necessary to re-cache Info.plist
touch "$FIREFOX_APP"