Examine source code of Ghibli Vol. 2

{
  "name": "Ghibli Vol. 2",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Firefox.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(60, 85, 145, 1)",
      "toolbar": "rgba(37, 53, 97, 1)",
      "bookmark_text": "rgba(229, 230, 232, 1)",
      "toolbar_field": "rgba(61, 81, 138, 1)",
      "toolbar_field_text": "rgba(229, 230, 232, 1)",
      "tab_line": "rgba(229, 230, 232, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d558aa0-e0fe-4edc-ac27-76bb9213e71d}"
    }
  }
}