I'm actually terrified of fireworks myself (please don't laugh) so this time of year is a nightmare for me. I actually got Miles on Nov. 5th last year and took him to the vets with fireworks going off everywhere. He wasn't scared at all - I was terrified!! Still, if you're worried I'd bring your bunny inside and create a calm, loving environment for it.
TOP TIP from a dog owner whose dog was terrified of fireworks: buy one of those meditation CDs from a new-age shop and put it on a loop whilst your pet is indoors hiding from the fireworks. It's calming, and it helps to mask out the noise.
AMETHYST