by Sheeo » 01 Oct 2015, 10:13
The first time you run FAF it'll ask if you want to link mumble, just say no and it won't try and launch mumble when you run FAF.
If you said 'yes' even though you don't have a working mumble (Or later uninstalled it), use options -> voice -> mumble options from the toolbar in the client and disable the mumble connector.