That study doesn't say "freak out". It says 83% ever showed "any fear" of fireworks, which is a huge variation. My doesn't like going outside when there are fireworks, but the sound of rain freaks him out way more.
Our dog is not ok with fireworks or gunshots. He either goes into the basement (normally off limits) or into the bedroom (mostly off limits) when he hears them.
However it also took him quite a few years to get over his fear of thunder.
I think he'll survive even though he'd be included in the 83%.