Examine source code of User-Agent Swit PC b8q

{
  "manifest_version": 2,
  "name": "User-Agent Switcher",
  "version": "1.0",
  "description": "Switches the User-Agent to a desktop version",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "useragent-switcher@example.com",
      "strict_min_version": "90.0"
    }
  }
}