One more hint...if you have access to a tripod, that helps, especially for fireworks. Even steadying your camera against a solid structure, like a post, will help prevent blur.
If you want GREAT saturated color photos, go with Kodak Portra 800 VC (for vivid color). It is a professional film and a bit more expensive, but in my opinion worth the $$. I know alot of people swear by Fuji...it does great with greens and blues, but I am a "red" person and Kodak handles those colors better, IMHO.
Slly