Examine source code of Krisstti kitty

{
  "theme": {
    "images": {
      "theme_frame": "krisstti_header.jpg"
    },
    "colors": {
      "frame": "#30281d",
      "tab_background_text": "#ffc31f"
    }
  },
  "version": "2.0",
  "name": "Krisstti kitty",
  "manifest_version": 2,
  "description": "My cat Krisstti in firefox persona form"
}