N.H. Rev. Stat. Ann. § 160-C:6

Any municipality in the state, by action of its local legislative body or local governing body, may vote to allow or to prohibit, within that municipality, the issuance of permits or licenses to sell permissible fireworks or the display or possession of permissible fireworks. If the municipality has voted to prohibit the issuance of permits or licenses or the display or possession of permissible fireworks prior to the effective date of this section, such decision shall remain in effect unless subsequent action is taken under this section.