Examine source code of Blue pretty sky

{
  "name": "Blue pretty sky",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "vector-beautiful-abstract-background-illustration.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(114, 135, 207, 1)",
      "bookmark_text": "rgba(114, 135, 207, 1)",
      "toolbar_field_text": "rgba(114, 135, 207, 1)"
    }
  }
}