Examine source code of Grey Horse

{
  "theme": {
    "images": {
      "theme_frame": "forefoxpersonagreyhorse.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "Grey Horse",
  "manifest_version": 2,
  "description": "A black and white images of a grey horse head with halter on a pale Grey background."
}