Examine source code of BR Black painterly

{
  "theme": {
    "images": {
      "theme_frame": "hdr-paint-alan-photos-4421104990_f1fb98c38f_o.jpg"
    },
    "colors": {
      "frame": "#1f1818",
      "tab_background_text": "#f2c67e"
    }
  },
  "version": "2.0",
  "name": "BR Black painterly",
  "manifest_version": 2,
  "description": "BR Black steam locomotive pulling a rake of cream and maroon coaches"
}