Question Summary:
Is it permissible for a muslim businessman to sell fireworks?

Question Detail:

 
Is it permissible for a muslim businessman to sell fireworks?
If not, what is the Shariah ruling against the selling of Fireworks?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
There is a leeway for Muslim to sell fireworks.[1]^,[2]
And Allah Ta’āla Knows Best
Hisham Dawood
Student Darul Iftaa
Chicago, USA 
Checked and Approved by,
Mufti Ebrahim Desai.