Fire crackling

Epic Soundsound effect

Breaking matches or the air bubbles in plastic wrapping sounds like the louder pops from (undried?) firewood.
– David Filskov

Crisp (potato chip) packets very slowly compressed with hands make a convincing crackling of fire.
– Tim Wright

I often gently wriggle a piece of foil to make the warm crackling sound of a fire.
– Joel Botham