Examine source code of Blackout 16x

{
  "name": "Blackout 16x",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "2020-08-11 01.05.19.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(0, 180, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 255, 0, 1)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgba(155, 0, 255, 1)"
    }
  }
}