Examine source code of Mario is back!

{
  "name": "Mario is back!",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "images.jpg"
    },
    "colors": {
      "frame": "rgba(242, 243, 245, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(207, 180, 180, 1)",
      "bookmark_text": "rgba(90, 79, 181, 0.64)",
      "toolbar_field": "rgba(44, 47, 186, 1)",
      "toolbar_field_text": "rgba(28, 10, 14, 1)"
    }
  }
}