... and what if the idea is complicated?
Welcome to LQ. We are all volunteers here... if you want to know how to write better questions, try reading the tutorial
or the long advise in my sig.
There are many things that could stop your mouse wheel from "working" in a given app. You need to clarify:
Which "Mozilla" is this? (Mozilla has several products.)
What is it about the mousewheel that doesn't work? (What are you trying to do with it?)
Are you doing this under linux or windows?