Examine source code of Amazom Redirect UK

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Amazom Redirect",
  "description": "Redirect amazon to amazon.co.uk",
  "version": "1.1",
  "manifest_version": 2,
  "author": "EyezOnly",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/16.png",
    "24": "icons/24.png",
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "webRequest",
    "*://amazon.com/*",
    "*://www.amazon.com/*",
    "*://amazon.in/*",
    "*://www.amazon.in/*",
    "*://amazon.ca/*",
    "*://www.amazon.ca/*",
    "*://amazon.de/*",
    "*://www.amazon.de/*",
    "*://amazon.fr/*",
    "*://www.amazon.fr/*",
    "*://amazon.jp/*",
    "*://www.amazon.jp/*",
    "*://amazon.com.au/*",
    "*://www.amazon.com.au/*",
    "webRequestBlocking"
  ]
}