Examine source code of cardigan

{
  "name": "cardigan",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "tumblr_7bca517c966395c14703454f4b8f790c_99e3b602_1280.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(97, 97, 97, 0.52)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.31)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0.69)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca9c0e59-7d48-4e40-8d56-36df9806d24c}"
    }
  }
}