From IdleOn MMO Wiki

What Firefly is used in
Drip of the Gods.png Drip of the Gods 10 M Smithing
Herculean Bug Pouch.png Herculean Bug Pouch 5 M Smithing
Wrangler of the Qoxzul.png Wrangler of the Qoxzul 5 M Smithing
Captalist Stats Stamp.png Captalist Stats Stamp Lots Stamps More Info.
GreenBubble29.png Tome Agility Lots Alchemy Bubble More Info.
Vial-level-1.png Firefly Grog 1.1 B Alchemy Vials More Info.