Examine source code of Rustic Cross

{
  "theme": {
    "images": {
      "theme_frame": "Firecross.jpg"
    },
    "colors": {
      "frame": "#8f0404",
      "tab_background_text": "#080400"
    }
  },
  "version": "2.0",
  "name": "Rustic Cross",
  "manifest_version": 2,
  "description": "Cross on flame coloured background"
}