Festival dijadwalkan dari 18 Jun hingga 21 Jun 2015 (3 hari).
Firefly Music Festival berlangsung di Dover, United Kingdom. Berikut adalah alamat lengkap festival: 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.
Genre dan sub-genre yang paling populer dari edisi sebelumnya adalah:
pop
rock
electronic
indie pop
indie
indie rock
alternative rock
alternative
electropop
electronica
new wave
synth-pop
experimental
chillout
rnb
acoustic
dance
disco
edm