Examine source code of Book Depository Redirect

{
  "manifest_version": 2,
  "name": "BD-Redirect",
  "version": "1.0",
  "description": "Redirect bookdepository.com links to URL without query params",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}