The home side started well and Kevin Gallen saw his shot cleared off the line by Adam Hinshelwoood.
QPR again pushed forward though it was Brighton who almost stole a goal through substitute Leon Knight.
But the match ended bitterly after 85 minutes when Furlong was sent off for appearing to kick out at Hinshelwood.
Brighton manager Mark McGhee: "I would like to stay, but there is uncertainty because of the financial situation.
"I accept that the club are not yet in a position to talk to me about it.
"Adam Hinshelwood is a tough player, and I would not expect my players to go down unless there is a very good reason to do so."
QPR: Day, Bignot, Shittu, Santos, Edghill, Ainsworth, Gallen,
Bean, Rowlands, Best (McLeod 59), Furlong.
Subs Not Used: Cole, Bircham, Branco, Miller.
Sent Off: Furlong (86).
Booked: Santos.
Brighton: Kuipers, Reid (Nicolas 79), Hinshelwood, Butters,
Mayo, Hart, Oatway, Carpenter, Harding, Virgo,
McCammon (Knight 45).
Subs Not Used: May, Watson, Jones.
Att: 15,898.
Ref: A D'Urso (Essex).