Examine source code of UE4 style theme

{
  "name": "UE4 style theme",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(221, 221, 221, 1)",
      "toolbar": "rgba(62, 62, 62, 1)",
      "bookmark_text": "rgba(221, 221, 221, 1)",
      "toolbar_field": "rgba(204, 204, 204, 1)",
      "toolbar_field_text": "rgba(133, 133, 133, 1)",
      "tab_line": "rgba(222, 163, 9, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ecc0edc8-5a18-40db-b048-aebe990089f1}"
    }
  }
}