Examine source code of Hell City Mascot

{
  "theme": {
    "images": {
      "theme_frame": "PersonaHeader_Mascot.jpg"
    },
    "colors": {
      "frame": "#e31919",
      "tab_background_text": "#120303"
    }
  },
  "version": "2.0",
  "name": "Hell City Mascot",
  "manifest_version": 2,
  "description": "Hell City is coming, don't miss your chance to possess your computer with this slick devil head persona!"
}