Examine source code of Faceblock2021

{
  "content_scripts": [
    {
      "js": [
        "content_script.js"
      ],
      "matches": [
        "*://facebook.com/*",
        "*://*.facebook.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "Die Zuckerbergbande war nicht so gut",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2,
  "name": "Faceblock2021",
  "version": "1.0.1"
}