N.J. Stat. Ann. § 40A:14-9.1

No municipality shall pass any ordinance, resolution, rule, regulation, order or directive, making residency therein a condition of employment for the purpose of original appointment, continued employment, promotion, or for any other purpose for any member of a paid fire department and force or paid member of a part-paid fire department and force, and any such ordinance, resolution, rule, regulation, order or directive in existence on the effective date of this act or passed hereafter shall be void and have no force or effect.