Examine source code of Sponge Bob Christmas

{
  "theme": {
    "images": {
      "theme_frame": "spongebob.jpg"
    },
    "colors": {
      "frame": "#51ff00",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sponge Bob Christmas",
  "manifest_version": 2,
  "description": "Have a Merry Christmas with Sponge Bob"
}