Creates the Firefighting Foam Act. Provides that, after June 30, 2021, a person, unit of local government, or State agency: (1) shall not use for training purposes a Class B firefighting foam that contains an intentionally added PFAS chemical and may use only training foam that does not contain such chemicals; and (2) shall not use for testing purposes a Class B firefighting foam that contains intentionally added PFAS chemicals unless the testing facility has implemented appropriate containment, treatment, and disposal measures to prevent releases of the Class B firefighting foam to the environment. Provides that the Act's prohibitions apply regardless of whether the testing is required by law or by a unit of local government or State agency having authority concerning testing by firefighters. Provides that the Act does not prohibit or restrict the manufacture, sale, or distribution of Class B firefighting foam that contains intentionally added PFAS chemicals or the use of Class B firefighting foam that contains intentionally added PFAS chemicals in an emergency firefighting operation or an emergency fire prevention operation. Effective immediately.