Examine source code of Blue Sky

{
  "name": "Blue Sky",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "boost-pattern.svg"
    },
    "colors": {
      "frame": "rgba(97, 147, 255, 1)",
      "tab_background_text": "rgba(112, 112, 112, 1)",
      "toolbar": "rgba(189, 191, 255, 0.29)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.34)",
      "toolbar_field_text": "rgba(33, 33, 33, 1)"
    }
  }
}