Examine source code of City Future

{
  "name": "Cyti Future",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Cyti Future.jpg"
    },
    "colors": {
      "frame": "rgba(146, 169, 224, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(87, 169, 199, 1)",
      "toolbar_field": "rgba(42, 49, 77, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{908a4fbb-ad56-43bd-b7a5-b961fa8abe0f}"
    }
  }
}