A box that contains the most valuable, either monetary or emotionally, items of a collection to be evacuated in the event of a fire/flood/baliff. Originally the tool of a record collector, it can refer to a collection of any kind. Also named "peel box" after the legendary DJ John Peel, and "panic box" in case of ermergency.
Firebox is referred to what one gets when playing with a dirty lady box. Physical contact with the box results in recurring rash with clusters of itchy or painful blistery sores appearing on the the pink oboe, lips, buttcheeks etc
Played all night with her but hell, she had firebox and this morning I'm all itchy and scratchy