Examine source code of NitroShare

{
  "manifest_version": 2,
  "name": "NitroShare",
  "version": "1.0.4resigned1",
  "description": "Integration with the NitroShare desktop client",
  "icons": {
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon38.png",
    "default_popup": "popup.html",
    "default_title": "Send URL with NitroShare"
  },
  "applications": {
    "gecko": {
      "id": "nitroshare-firefox@nitroshare.net"
    }
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv6/L+Ye+qjH2KSnXo5CvYO2J25T03a1PGcu7zELfuPUZWXoEZosoHQ3KVqU6dTKzgLdqKQziJwohflL6KZInxnhOvkqbChQ5JHtufbGRnQ/sELfPmvhCzZx+I2ZW71b0c92QKPJohJjA8+bu8JvBHOjsXLb0t5cH2q0cFItnjto+9ingTQh6uMP6PZ90E7p/yuM+OyQwxq0xhdyRTr8G0dxUE5SLXHvOwmUw6auGFT0FVDe9OaIng8YfrN9H2NEqDbxftPkELHfWkMKsCHjwY3fexknmL4xSK+uQULeEeYYjr459FRZApS87Cb0ph8Yniuq8v9fTgAkceaHt9t0/YQIDAQAB",
  "permissions": [
    "activeTab",
    "nativeMessaging"
  ]
}