Indigo does not like fireworks.
He's currently pacing about the house, trying to settle - then something goes bang and he decides that if something is going bang, he needs to find somewhere else to be, because maybe things won't go bang there. He's dosed up on Rescue Remedy, and I'll give him some peanut butter once he's sat down for long enough, but there's nothing to do except wait it out - hopefully, as fireworks night (and Diwali) was yesterday, tonight will be a little more low-key.
Holly does not give a shit about fireworks. Unless they're somehow edible.