No worries, the only fireworks I play with these days involve a trigger, hammer and .45 cal shell. And with both hands on the grip, it's impossible for my thumb to be 'in play'.
If God intended aircraft engines to have horizontally opposed engines, Pratt and Whitney would have made them that way.
I had a very enjoyable 4th of July...it started bright and early at 6am with a half-marathon. And ended with lots of food, fun, friends, family, and fireworks. 8-)