Yes, however, Firefly does not facilitate the re-selling of passes.
Please note that if you are selling a pass to someone else, the deadline to change the shipping address to the new person's address was April 15, 2017. If you sell your pass after this deadline, then the pass will still be shipped to you. You will then be responsible for getting/sending the tickets to the new person. Also note that the pass does not have to be in the new person's name. As long as the new participant has the wristband in hand at the festival, they will be good to go. Also, there is a "Register Wristband" link available on the Firefly website and the new person will be able to register the wristband in their name.