Examine source code of Blockchain Nocturne

{
  "name": "Blockchain",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(59, 59, 59, 1)",
      "tab_background_text": "rgba(227, 227, 227, 1)",
      "toolbar": "rgba(46, 46, 46, 1)",
      "bookmark_text": "rgba(227, 227, 227, 1)",
      "toolbar_field": "rgba(61, 61, 61, 1)",
      "toolbar_field_text": "rgba(176, 176, 176, 1)",
      "tab_line": "rgba(117, 117, 117, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8b90ef79-022a-428e-905c-24cdc7365251}"
    }
  }
}