Examine source code of Unit-price

{
  "manifest_version": 3,
  "name": "Unit-price",
  "description": "Sort walmart.com by unit price.",
  "version": "1.0.0.2",
  "icons": {
    "512": "icon512.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_icon": {
      "512": "icon512.png"
    }
  },
  "host_permissions": [],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "unit-price@becausecurious",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}