Cross Platform pFF OSX script has to be edited with your current DEVICE name to work.
With this code Firefox start and sync from any OS X devices/volumes without edit needed:
#!/bin/sh
here="`dirname \"$0\"`"
echo "Starting Firefoxfrom $here!"
cp "$here/compreg/compreg_mac.dat" "$here/profile/compreg.dat"
sh "$here/Firefox.app/Contents/MacOS/firefox" -profile "$here/profile"
echo "Done!"
echo "Finishing Firefox!"
cp "$here/compreg/compreg_win.dat" "$here/profile/compreg.dat"
echo "Done Syncing!"