Dark Fenix wót Andrei Petcu

This is a dark theme inspired by the new Firefox for Android release (Fenix). Edit theme here https://color.firefox.com/?theme=XQAAAAJOAgAAAAAAAABBKYhm849SCicxcUEYWXcGHf3p79EhVPXcat1ibRs96ktQ0TyEhVChwihRJ-nFKYvtBDrIzoVHyFSOVzaGVuttRSkPDlUwA0SmjF7Mfue