Examine source code of FullStop: Website Blocker

{
  "manifest_version": 2,
  "incognito": "spanning",
  "name": "FullStop: Website Blocker",
  "version": "1.2",
  "description": "Built for absolute digital minimalism, It enforces your predefined limits, securing your attention",
  "permissions": [
    "nativeMessaging",
    "tabs",
    "webNavigation",
    "storage"
  ],
  "background": {
    "scripts": [
      "core/background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fullstop@getfullstop.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "core/scanner.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://m.youtube.com/*"
      ],
      "js": [
        "modules/youtube/engine.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "ui/blocked.html",
    "ui/blocked.js",
    "modules/youtube/selectors.json"
  ]
}