Examine source code of Wykop 4K

{
  "manifest_version": 2,
  "name": "Wykop 4K",
  "version": "1.3",
  "description": "Zwiększa jakość obrazków na monitorach o wysokim PPI/DPI.",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wykop.pl/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2659e68a-e411-40fe-81e8-610d79200f19}"
    }
  }
}