Examine source code of Blue Angel

{
  "theme": {
    "images": {
      "theme_frame": "angel.jpg"
    },
    "colors": {
      "frame": "#7edbf7",
      "tab_background_text": "#a9d2f5"
    }
  },
  "version": "2.0",
  "name": "Blue Angel",
  "manifest_version": 2,
  "description": "Image from zerochan"
}