Firebug was the manager of the Pebble district heating plant. She disappeared from Equestria with the Arcane Helix while trying to rescue some comrades from it, thereby arriving in the Dread Dimensions. Firebug lost her unicorn magic to a strange illness after being attacked by a monster in the Helix; she got it back (and then some) by becoming a priestess of the goddess En-Bequ'avar, Shadhavar deity of fire, forge and hearth. Firebug participated in the defeat of unicorn lich Dusty Tomes. She was made the Matriarch of the Outer Lands for political reasons, thereby being promoted to the status of archpriestess only a few days after her original ordination.

Firebug was romantically involved with the pegasus Shady Jay. She was good friends with Wiggles and Epona Moonbeam. Her relationship with Revolution Rosie was highly variable.

Left to right: Firebug at the Pebble district heating plant, Firebug wearing Shear Steel's robe and diadem, Firebug as the Matriarch of the Outer Lands (later, of Equus) of the Temple of En-Bequ'avar. Note that the artist's conception on the far right does not depict her usual cutie mark.