Examine source code of Anti-UTTP

{
  "manifest_version": 3,
  "name": "Anti-UTTP",
  "version": "1.0.11",
  "description": "Automatically hides UTTP comments",
  "action": {
    "default_icon": {
      "80": "icons/logo-80.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "uttpblocker@dontcomeafterme.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ]
}