Examine source code of Cute Cat Wallpapers

{
  "manifest_version": 2,
  "name": "Cute Cat Wallpapers",
  "description": "This addon displays cute cat images to bring a relaxing and joyful vibe every time open browser.",
  "version": "1.0.0",
  "offline_enabled": true,
  "browser_action": {
    "default_title": "Cute Cat Wallpapers"
  },
  "background": {
    "scripts": [
      "sw.js"
    ],
    "persistent": false
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3039f4ec-ffa1-4861-bc2b-2f31c2dce68e}"
    }
  }
}