Examine source code of Arlecchino glitch

{
  "name": "Arlecchino glitch",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "arlefirefoxes.png"
    },
    "colors": {
      "frame": "rgba(33, 19, 18, 0.74)",
      "tab_background_text": "rgba(214, 214, 214, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(214, 214, 214, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(214, 214, 214, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1de6ef43-d844-4751-a375-ef1fffde6784}"
    }
  }
}