Examine source code of Snapchat Web Bypass

{
  "manifest_version": 2,
  "name": "Snapchat UA Changer",
  "version": "1.0",
  "description": "Changes the User-Agent for Snapchat",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e0cf9cc-9e51-40e8-9d4d-66cec15fedba}"
    }
  }
}