Examine source code of NitroPlus

{
  "name": "NitrogenSports Plus",
  "description": "This extension allows NitrogenSports users to take part in promotions on the site and receive special bonuses.",
  "version": "1.0",
  "permissions": [
    "*://nitrogensports.eu/*"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://nitrogensports.eu/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "manifest_version": 2
}