Examine source code of Little Gray Kitten

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_grey-cat.jpg"
    },
    "colors": {
      "frame": "#1a4527",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "Little Gray Kitten",
  "manifest_version": 2,
  "description": "A beautiful Kitten."
}