Examine source code of Nagatoro

{
  "name": "Nagatoro",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled.png"
    },
    "colors": {
      "frame": "rgba(98, 101, 180, 1)",
      "tab_background_text": "rgba(40, 42, 54, 1)",
      "toolbar": "rgba(98, 101, 180, 0.3)",
      "bookmark_text": "rgba(248, 248, 242, 1)",
      "toolbar_field": "rgba(248, 248, 242, 0.3)",
      "toolbar_field_text": "rgba(40, 42, 54, 1)",
      "tab_line": "rgba(40, 42, 54, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6674b24c-5cf4-4282-b656-6597843e8e8e}"
    }
  }
}