Examine source code of The WHAT extension??

{
  "name": "The WHAT extension??",
  "description": "This extension highlights some of the funny words on the web.",
  "manifest_version": 3,
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "128": "edge.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "edge-extension@zudo.space"
    }
  }
}