343i, PLEASE make a new update for ODST firefight. Add a system to search for players to play some firefight!!! None of my friends wanna play with me 
I highly doubt they will, if you ask on the ODST section Iâm sure youâll find people willing to play with you
Firefight matchmaking in ODST would be unplayable. It was built on Halo 3âs campaign engine. The game shared host between each player, so if one person quit the game ends. It would be too easy to exploit and grief.
âWhen we first started toying around with what became Firefight, we all knew we wanted to have Matchmaking for it,â said Halo 3: ODST design lead Lars Bakken. âWe also knew that would mean some pretty heavy investment on the networking side, which meant more people, and unfortunately it was quickly shot down. The Halo 3 engine doesnât have support for Matchmaking in our synchronous networking model (which is what powers Campaign and Firefight), so we couldnât do it within the scope of this project. It still bums me out, but there are always things you canât do, and you just have to move on.â
It simply isnât possible and honestly not worth it due to the low amount of players ODST now has, four years after release.