Examine source code of ReadInbox Web Clipper

{
  "manifest_version": 3,
  "name": "ReadInbox Web Clipper",
  "description": "Clip web pages and send them to ReadInbox.",
  "version": "1.0.1",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clipper@readinbox.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "websiteContent"
        ]
      }
    }
  },
  "action": {
    "default_title": "ReadInbox Clipper",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://readinbox.io/*"
  ]
}