Examine source code of NPM Explorer & Downloader

{
  "manifest_version": 3,
  "name": "NPM Explorer & Downloader",
  "version": "0.1.0",
  "description": "Explore npm packages, view dependency tree, graph and download tarballs (latest).",
  "action": {
    "default_popup": "popup.html",
    "default_title": "NPM Explorer"
  },
  "permissions": [
    "downloads",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@npm-downloader",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}