Festivalen blev planlagt fra 18 jun til 21 jun 2015 (3 dag(e)).
Firefly Music Festival finder sted i Dover, United Kingdom. Her er den fulde adresse på festivalen: The Woodlands of Dover International Speedway, Dover
The Killers, Hozier, Paul McCartney, Lizzo, Halsey, Mother Mother, Snoop Dogg, Glass Animals, The Chainsmokers, Bastille, Kygo, Morrissey, Tove Lo, The Kooks, Cage the Elephant.
De mest populære genrer og undergenrer i den foregående udgave var:
pop
rock
electronic
indie pop
indie
indie rock
alternative rock
alternative
electropop
electronica
new wave
synth-pop
experimental
chillout
rnb
acoustic
dance
disco
edm