Examine source code of Pine and butterfly

{
  "theme": {
    "images": {
      "theme_frame": "Pineandbutterfly4.jpg"
    },
    "colors": {
      "frame": "#0f0500",
      "tab_background_text": "#cefc03"
    }
  },
  "version": "2.0",
  "name": "Pine and butterfly",
  "manifest_version": 2,
  "description": "Nature scenery: sunny day, pine forest, and little butterfly."
}