Examine source code of Remove-Iframe-4anime-to

{
  "manifest_version": 2,
  "name": "Remove-Iframe",
  "version": "1.0.0",
  "description": "Removes all iframe from 4anime",
  "content_scripts": [
    {
      "matches": [
        "https://4anime.to/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ]
}