Examine source code of John Deere56

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#1b4a03",
      "tab_background_text": "#ffd000"
    }
  },
  "version": "2.0",
  "name": "John Deere56",
  "manifest_version": 2,
  "description": "John Deere Logo with 1956-1968 Logo"
}