Examine source code of UrleBird

{
  "name": "UrleBird",
  "description": "Use UrleBird instead of TikTok to view profiles.",
  "version": "4.1",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko_android": {},
    "gecko": {
      "id": "{73e69d83-b4b4-4a16-b6c7-7d743a6b5243}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "256": "urlebird.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.tiktok.com/*"
  ]
}