I think you need to find a more specific source of local laws. The Texas page in that link is very general. For example, Austin sits in Travis and Williamson counties. In the Travis county portion of Austin, all Class C fireworks are illegal - possesion, sale, etc, but in the Williamson county part (my hood) it's anything goes.
So I'd go straight to the horse's mouth and check with local law enfocement. And with drought conditions in many areas, fireworks usually permitted may be currently banned because of conditions.