Examine source code of Elementary Oscuro

{
  "name": "Elementary Oscuro",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Captura realizada el 2019-05-30 10.02.01.png"
    },
    "colors": {
      "frame": "rgba(58, 63, 68, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(58, 63, 68, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.21)",
      "toolbar_field_text": "rgba(129, 135, 140, 0.96)"
    }
  }
}