Examine source code of Req Export

{
  "manifest_version": 2,
  "name": "Req Export",
  "version": "1.0.0",
  "description": "Export selected Firefox DevTools Network requests as .req files.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "devtools_page": "devtools.html",
  "permissions": [
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "req-export-devtools@batako.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}