Examine source code of Kira Death Note

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0084ff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Kira Death Note",
  "manifest_version": 2,
  "description": "Base photo of Light is owned by joaopaulosousa on deviantart . I just edited it afterwards and made this theme so thanks to him :)"
}