Hello KingNBubby,
The First Firewall mission on Earth is the 1st part of the [u]Sleeper Simulant Quest-line[/u] and can be obtained by giving [b]Banshee-44[/b]
The random Fusion rifles hat drops randomly. After you've given him 4. Then you will have to wait untill [b]the 7th February/any moth[/b] but only on the 7th can you acces "The First Firewall" mission.
Hopefully this help you with any issues.
Best Regards ItzCharged, Community Volunteer