Examine source code of Sunset landscape

{
  "manifest_version": 2,
  "name": "Sunset landscape",
  "description": "Bringing beautiful natural sunset landscapes",
  "version": "1.0",
  "offline_enabled": true,
  "background": {
    "scripts": [
      "sw.js"
    ],
    "persistent": false
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb6c182d-33e2-475e-9801-97e508896dcd}"
    }
  }
}