Examine source code of Purple Kitty

{
  "theme": {
    "images": {
      "theme_frame": "cat_skin_top.jpg"
    },
    "colors": {
      "frame": "#ababab",
      "tab_background_text": "#ffccff"
    }
  },
  "version": "2.0",
  "name": "Purple Kitty",
  "manifest_version": 2,
  "description": "A cute little kitty to sit in the corner of your browser."
}