Examine source code of Ruggero 1

{
  "name": "Ruggero 1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "NewRuggero.png"
    },
    "colors": {
      "frame": "rgba(25, 90, 230, 1)",
      "tab_background_text": "rgba(12, 240, 225, 1)",
      "toolbar": "rgba(3, 65, 235, 1)",
      "bookmark_text": "rgba(16, 172, 224, 1)",
      "toolbar_field": "rgba(250, 250, 250, 1)",
      "toolbar_field_text": "rgba(17, 167, 217, 1)"
    }
  }
}