Examine source code of DNTReedPop

{
  "description": "Prevents ReedPop sites from disabling iframes if you don't accept tracking cookies",
  "manifest_version": 2,
  "name": "DNTReedPop",
  "version": "1.3",
  "homepage_url": "https://eurogamer.net",
  "icons": {
    "48": "dnt48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.eurogamer.net/*",
        "*://*.eurogamer.cz/*",
        "*://*.eurogamer.de/*",
        "*://*.eurogamer.es/*",
        "*://*.eurogamer.it/*",
        "*://*.eurogamer.nl/*",
        "*://*.eurogamer.pl/*",
        "*://*.eurogamer.pt/*",
        "*://*.rockpapershotgun.com/*",
        "*://*.gamesindustry.biz/*",
        "*://*.usgamer.net/*",
        "*://*.vg247.com/*"
      ],
      "js": [
        "dnt.js"
      ]
    }
  ]
}