Examine source code of lightning2

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#030312",
      "tab_background_text": "#ee0cf2"
    }
  },
  "version": "2.0",
  "name": "lightning2",
  "manifest_version": 2,
  "description": "My second picture"
}