Examine source code of VSIX Downloader

{
  "manifest_version": 3,
  "name": "VSIX Downloader",
  "description": "Quickly download VS Code extensions as .vsix files from the Marketplace for easy local installation.",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "vsix-downloader@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "16": "assets/logo-16.png",
    "48": "assets/logo-48.png",
    "128": "assets/logo-128.png",
    "256": "assets/logo-256.png"
  },
  "permissions": [
    "activeTab"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://marketplace.visualstudio.com/items?*"
      ],
      "js": [
        "download.js"
      ]
    }
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ]
}