Examine source code of Healthy YouTube

{
  "manifest_version": 3,
  "name": "Healthy YouTube",
  "version": "0.37",
  "description": "Makes YouTube a healthier place by removing distractions.",
  "browser_specific_settings": {
    "gecko": {
      "id": "healthy-youtube@gkpo",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://m.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "blockers.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon_16.png",
      "48": "icon_48.png",
      "128": "icon_128.png"
    }
  }
}