Mmm... That bad? In that case, you could simply note where the fireworks are coming from, and if there is a car (or cars) parked on the driveway, sneak out late at night when they're in bed and let down their tyres, 'key' the doors, pour some brake fluid over the bonnet and/or pop a nice 'wee note' on their windscreen outlining *exactly* what you think of the scum, anonymously of course...
Trust me, if someone was annoying me that much, making my life hell, and they lived locally, I'd be meting out some sort of retribution!
Marco.