Examine source code of Yasi

{
  "name": "Yasi",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Outlook-0orh5iea.png"
    },
    "colors": {
      "toolbar": "rgba(191, 27, 27, 0)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(40, 141, 224, 1)",
      "frame": "rgba(107, 121, 153, 1)",
      "tab_background_text": "rgba(5, 0, 0, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)"
    }
  }
}