Examine source code of Home – Your New New Tab

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.5.4",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "home@itst.net",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_title": "__MSG_extensionName__"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; img-src https://images.pexels.com blob:; connect-src https://hp.itst.net https://images.pexels.com;"
  }
}