Examine source code of Source Map Downloader

{
  "manifest_version": 2,
  "name": "Source Map Downloader",
  "version": "4.0",
  "description": "Download source code from source maps in Developer Tools.",
  "devtools_page": "devtools.html",
  "permissions": [
    "<all_urls>",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "kudos6566@gmail.com",
      "strict_min_version": "140.0"
    }
  }
}