The firefighter was hospitalized with what were characterized as minor injuries following the mayday call on Henry Street, they said.
The three-alarm blaze broke out on the second floor of the unoccupied, 2½-story home before quickly extending shortly after 7 p.m.
Firefighters had it knocked down in under an hour.
The cause wasn't immediately determined.
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ALL PHOTOS: Damien Danis for DAILY VOICE
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ALSO SEE (w/photos): Firefighters responding to a call found the second floor and basement of a Ridgefield multi-family home fully involved Monday afternoon. Part of the roof collapsed soon after.
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