I live in Washington State, which for better or for worse has pretty open laws when it comes to fireworks on the 4th of July.
So, family tradition being inspired by my son and grandson, we stock up on especially mortars, as close as we can come to the "big guns" at the big shows.
Anyway, I set up my Canon 5D on a tripod with a cable release, co-ordinated with my son to get my aim right, then set back and enjoyed the show!