Examine source code of toughts

{
  "name": "toughts",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "roden.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 140, 0, 1)",
      "toolbar": "rgba(99, 99, 99, 0.73)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(173, 173, 173, 0.67)",
      "toolbar_field_text": "rgba(3, 3, 3, 1)",
      "tab_line": "rgba(255, 132, 0, 0.59)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0457e80b-4b9c-4523-9a9b-019c0ff9de01}"
    }
  }
}