Examine source code of Magnet helper

{
  "manifest_version": 2,
  "name": "Magnet helper",
  "version": "1.0",
  "description": "Sends magnet links to a server to download",
  "icons": {
    "48": "icons/transmission-remote-gtk-48.png",
    "96": "icons/transmission-remote-gtk-96.png"
  },
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "protocol_handlers": [
    {
      "protocol": "magnet",
      "name": "Magnet helper",
      "uriTemplate": "/magnetHelper.html#!/%s"
    }
  ]
}