Examine source code of Website Blocker

{
  "manifest_version": 2,
  "name": "Website Blocker",
  "version": "1.0",
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_page": "options.html",
  "web_accessible_resources": [
    "blocked.html"
  ],
  "icons": {
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{023d3ec4-b0ad-4681-b89f-6753692e9674}"
    }
  }
}