Sorry if this was answered already. Re: orange guys and fireworks.
MDMA, also known as Orange Bandits.
orange bandits*- Methylenedioxymethamphetamine (MDMA)
http://www.noslang.com/drugs/dictionary/o/
Fireworks, I was watching a movie this morning. Guy had guns and ammo in his van, called them fireworks. So I believe MS was using fireworks as the slang term for gun.
I don't think it was orange tarps, shirts or pylons in referring to "orange guys" MS had no problem asking for gloves and tape, why a code name for tarps, shirts etc? I do believe MS asked DM for a drug.
Fireworks can also be used to refer to any sudden burst of excitement or violence, such as starting a fight or an argument. I wouldn't expect it to be used to refer to a clandestine mission where everything is supposed to go down quietly. Unfortunately the language is cryptic enough to allow for reasonable doubt.
Apparently MDMA can cause feelings of empathy. Maybe DM was selling/giving away his prescription?
Whatever orange guys is it is referred to in very familiar terms, something plural that is used frequently. Drugs sounds about right.