Examine source code of Sonic wallpaper 2

{
  "theme": {
    "images": {
      "theme_frame": "sonicwallpaper.png"
    },
    "colors": {
      "frame": "#074cd6",
      "tab_background_text": "#074cd6"
    }
  },
  "version": "2.0",
  "name": "Sonic wallpaper 2",
  "manifest_version": 2,
  "description": "It is my second try at a sonic wallpaper."
}