Examine source code of bookshelf

{
  "theme": {
    "images": {
      "theme_frame": "books-1.jpg"
    },
    "colors": {
      "frame": "#ada6a6",
      "tab_background_text": "#e9f728"
    }
  },
  "version": "2.0",
  "name": "bookshelf",
  "manifest_version": 2,
  "description": "rows and rows of books..."
}