Firefighters - As introduced, extends the period for the estate of an emergency responder killed in the line of duty from three years from the date of death to the later of such date or the date of a final order of a court, administrative law judge, or authorized state or local official designating the death as being in the line of duty; extends the period for an estate to file an appeal of a denial from 90 days to one year; adds a mechanism of appeal of a denial of a claim for the estates of firefighters, volunteer rescue squad workers, and emergency medical technicians. - Amends TCA Title 4, Chapter 24; Title 7, Chapter 51, Part 2; Title 38, Chapter 8 and Title 68, Chapter 140.