Examine source code of Block YouTube v2

{
  "manifest_version": 3,
  "name": "Block YouTube v2",
  "version": "1.0",
  "description": "Tiện ích chặn truy cập YouTube",
  "permissions": [
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://youtube.com/*"
  ],
  "background": {
    "scripts": [
      "blocker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "block-youtube-v2@example.com"
    }
  }
}