Examine source code of Blue Night Trees

{
  "theme": {
    "images": {
      "theme_frame": "asdfasdf.jpg"
    },
    "colors": {
      "frame": "#f01616",
      "tab_background_text": "#050505"
    }
  },
  "version": "2.0",
  "name": "Blue Night Trees",
  "manifest_version": 2,
  "description": "A blue night with some pine trees"
}