Examine source code of netflix-er

{
  "manifest_version": 2,
  "name": "netflixer",
  "version": "1.3",
  "description": "Adds functions to netflix",
  "browser_specific_settings": {
    "gecko": {
      "id": "martin@kasman.sk",
      "strict_min_version": "94.0"
    }
  },
  "icons": {
    "48": "icons/netflixer-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "js": [
        "netflixer.js"
      ]
    }
  ]
}