Examine source code of Sika Deer medium

{
  "theme": {
    "images": {
      "theme_frame": "forefoxpersonasikadeersm.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "Sika Deer medium",
  "manifest_version": 2,
  "description": "Sika deer in winter on a pale grey background. Suitable for screen resolution up to 1800 px wide"
}