Examine source code of Rammstein_rostig

{
  "name": "Rammstein_rostig",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "kopfzeile_hg_rostig.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(51, 51, 51, 1)"
    }
  }
}