Examine source code of YouTube Time Limiter

{
  "manifest_version": 3,
  "name": "YouTube Time Limiter",
  "version": "1.0.2",
  "description": "A daily watch-time budget for YouTube. Run out and it's blocked for a cooldown. Watching a blocked video or loosening the rules takes deliberate friction.",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-limiter@milo",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "friction.js",
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "YouTube Time Limiter",
    "default_icon": "icons/icon.svg"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  }
}