Examine source code of Celular YouTube Blocker

{
  "manifest_version": 2,
  "name": "Celular YouTube Blocker",
  "version": "1.0",
  "description": "Blocks YouTube when using a mobile (celular) network.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "notifications",
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "key": "abcdefghijklmnopqrstuvwxyzabcdef",
  "browser_specific_settings": {
    "gecko": {
      "id": "{edb38017-fb50-4973-8774-7dfbf299dc9f}"
    }
  }
}