Etymology
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firebug (n.)

also fire-bug, "arsonist, incendiary," 1869, from fire (n.) + bug (n.) in the "obsessed person" sense.

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Definitions of firebug

firebug (n.)
a criminal who illegally sets fire to property;
Synonyms: arsonist / incendiary
firebug (n.)
a true bug: brightly colored bug that can exude a stain;
From wordnet.princeton.edu