Examine source code of Renaissance Kingdoms

{
  "name": "Renaissance Kingdoms",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Firma_Dairon_Gran_Maestro.png"
    },
    "colors": {
      "toolbar": "rgba(194, 77, 14, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "frame": "rgba(153, 72, 14, 1)",
      "tab_background_text": "rgba(74, 33, 25, 1)",
      "bookmark_text": "rgba(10, 5, 1, 1)"
    }
  }
}