Examine source code of Black Catgirl

{
  "theme": {
    "images": {
      "theme_frame": "3.jpg"
    },
    "colors": {
      "frame": "#544e4e",
      "tab_background_text": "#bfbdbd"
    }
  },
  "version": "2.0",
  "name": "Black Catgirl",
  "manifest_version": 2,
  "description": "Dark Manga / Anime Catgirl design"
}