Examine source code of FocusTube

{
  "manifest_version": 3,
  "name": "FocusTube",
  "version": "2.0.0",
  "description": "Transform YouTube into a distraction-free, intentional learning platform",
  "web_accessible_resources": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "resources": [
        "icons/*.png",
        "assets/index.js-CXeAIqT0.js"
      ],
      "use_dynamic_url": false
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "assets/service-worker.js-s3h8LeU2.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "focustube@mergepoint.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "assets/index.js-CXeAIqT0.js"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_idle"
    }
  ]
}