Examine source code of Tor Dark

{
  "name": "Tor Dark",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Progetto senza titolo(1).png"
    },
    "colors": {
      "frame": "rgba(71, 13, 101, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(43, 4, 61, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(60, 60, 60, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{acc44c3f-c05f-4776-9149-22fbdfcc5b7f}"
    }
  }
}