Examine source code of Download Manager

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "version": "1.1.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png",
    "256": "icons/256.png"
  },
  "default_locale": "en",
  "permissions": [
    "downloads",
    "downloads.open",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "download-manager@breadgrocery.github.com",
      "strict_min_version": "112.0"
    }
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "__MSG_extension_name__",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}