Examine source code of PageInfo

{
  "manifest_version": 3,
  "name": "PageInfo",
  "version": "1.0.0",
  "description": "Simple page information viewer. See page title, URL, word count, and image count.",
  "icons": {
    "48": "imgs/icon-48.png",
    "96": "imgs/icon-96.png",
    "128": "imgs/icon-128.png"
  },
  "action": {
    "default_icon": {
      "48": "imgs/icon-48.png",
      "96": "imgs/icon-96.png"
    },
    "default_title": "PageInfo",
    "default_popup": "viewer/info.html"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pageinfo@details.viewer",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}