Examine source code of Book Shelf

{
  "theme": {
    "images": {
      "theme_frame": "bookpersona.jpg"
    },
    "colors": {
      "frame": "#878787",
      "tab_background_text": "#87e5f0"
    }
  },
  "version": "2.0",
  "name": "Book Shelf",
  "manifest_version": 2,
  "description": "Books, Bookshelf, literature, classics, photo, vonnegut, walden, orwell, homer"
}