Examine source code of DownExtZip

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "2.1",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "128": "icon.png"
  },
  "action": {
    "default_title": "__MSG_appName__",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "DownExtZip@DownExtZip"
    }
  }
}