Portable Firefox OS X
I've packaged a Mac OS X version using this script so you can launch it with a double click from any device:
#!/bin/sh
here="`dirname \"$0\"`"
echo "Starting Firefox from '$here'."
echo "Wait a while before Firefox start."
sh "$here/app/Firefox.app/Contents/MacOS/firefox" -profile "$here/profile"
echo "Done!"
echo "When finish, quit Terminal.app before eject your portable device."