Examine source code of May Club

{
  "name": "Oil Painting",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "1000050591.jpg"
    },
    "colors": {
      "frame": "rgba(117, 106, 217, 1)",
      "tab_background_text": "rgba(145, 19, 19, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ceb78b28-327b-4ba3-8dfe-467e6136e7e8}"
    }
  }
}