Examine source code of WG Credentials Notifier

{
  "manifest_version": 3,
  "name": "WG Credentials Notifier",
  "version": "1.0.7",
  "description": "The extension shows a notification if a user tries to use corporate credentials on third-party sites.",
  "icons": {
    "48": "images/icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "pages/popup.html"
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "js": [
        "scripts/allowed_domains.js",
        "scripts/content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5381711d-b1c3-471f-b7b0-3abea6640370}"
    }
  }
}