Examine source code of Falling In Reverse 2

{
  "theme": {
    "images": {
      "theme_frame": "FallinginReverseFirefox2jpg.jpg"
    },
    "colors": {
      "frame": "#c40fd9",
      "tab_background_text": "#c40fd9"
    }
  },
  "version": "2.0",
  "name": "Falling In Reverse 2",
  "manifest_version": 2
}