Walk your dog during in the day time before fireworks are likely to start.
When the fireworks start:
Play some music or TV to reduce the firework noise.
Close windows and curtains to reduce the sound from firecrackers and blackout your dog from any flashes of fireworks.
Provide your dog toys and stuff that they enjoy. Make sure you play with your dog.
You can play with a toy and see if your dog join you, don't push them to play.
Don't try your dog out if they hide form the firework noise, they can become more stressed.
Try playing soft sounds of fireworks mix with something they like to hear so your dog is used to hearing them.
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