Examine source code of explaination

{
  "name": "explaination",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "bubbles.jpg"
    },
    "colors": {
      "frame": "rgba(18, 19, 20, 1)",
      "tab_background_text": "rgba(209, 20, 20, 1)",
      "toolbar": "rgba(99, 47, 47, 1)",
      "bookmark_text": "rgba(138, 75, 75, 1)",
      "toolbar_field": "rgba(92, 64, 64, 1)",
      "toolbar_field_text": "rgba(107, 27, 27, 1)"
    }
  }
}