Examine source code of Blackout Beach

{
  "name": "black",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "black.jpg"
    },
    "colors": {
      "frame": "rgba(51, 51, 51, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(30, 30, 47, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(237, 237, 237, 1)",
      "toolbar_field_text": "rgba(51, 51, 51, 1)",
      "tab_line": "rgba(173, 216, 230, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{540150cd-a16d-43c0-bbd7-16ae8478c384}"
    }
  }
}