As Peter and Paul said, but what it all comes down to in the end is that the match will go out once all its fuel is consumed. And, unlike in our atmosphere, that fuel would have to be an oxidising substance, not wood. There is practically no free oxidising material on those planets, and if there were, it would not last long because it would "burn up" in all that hydrogen.
As for the danger of the whole lot going up if ignited, forget it. There is plenty of lightning on Jupiter and the other gas giants, so if the atmosphere could burn, it would have done so billions of years ago.