Firebrand theories?
First off, Firebrand can't tell Noah everything, as we saw in INTERCEPTION. The Administrator can't control Firebrand, but he can prevent him from {REDACTED} everything he needs to know. And Firebrand is, in a way, a paradox. He is able to help Noah for now, but once Noah draws Severance on the Journal, Firebrand will either die, or be controlled by the Collective. By the end of TT, we may not even remember who Firebrand was, or if he even existed. This is where HABIT comes in. Firebrand needs HABIT in order to keep himself liberated. Without him, Firebrand would be trying to stop Noah, albeit against his will. So I think I know what the deal between HABIT and Firebrand is. HABIT will keep Firebrand liberated long enough for Noah to do what he needs to do and sometimes help Noah so that way Firebrand exists. In return, Firebrand has to make sure Noah kills Slender Man, so that HABIT can deal with Patrick without Stick-in-the-mud getting in the way. Knowing the two, HABIT will pull a fast one and grab the journal as soon as Noah gets it so that he'll have the glory of killing Slender Man, and Firebrand will try and kill HABIT because he hates him. These are just theories, don't forget. But tell me what you think, because I may have missed a few details.