Etymology
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firewall (n.)

also fire-wall, 1851 as a physical wall meant to prevent the spread of fire in a structure, from fire (n.) + wall (n.). Computer sense (originally figurative) is by 1990.

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Definitions of firewall

firewall (n.)
(colloquial) the application of maximum thrust;
he moved the throttle to the firewall
firewall (n.)
(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet;
firewall (n.)
a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle;
From wordnet.princeton.edu