Examine source code of night sky black

{
  "name": "night sky black",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "night sky format.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(191, 191, 191, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.62)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0.16)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c2b4270-d852-4f2a-aef6-53af71be2433}"
    }
  }
}