Examine source code of Sky Theme

{
  "name": "Sky Theme",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "thumpphail.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(74, 74, 74, 1)",
      "toolbar": "rgba(194, 221, 255, 1)",
      "bookmark_text": "rgba(219, 219, 219, 1)",
      "toolbar_field": "rgba(127, 180, 255, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ab18922-cfbe-4865-8a35-34de03eea189}"
    }
  }
}