Is Firewall required in North Florida 2005 single story home?
The only requirement for a firewall that I am aware of, between the garage and living space was a layer of 5/8" fire code sheetrock over the whole wall that separates the garage from the living space. If there is a living space above the garage, then the ceiling needed it too. Although I think the latter statement is state specific. I believe in WA state it is not needed on the ceiling, at least in a new home I was working on, but in Maryland it was required.

The door into the garage from the house needed to be rated to withstand a 20 minute fire exposure.