Examine source code of oldReddit-redirect

{
  "description": "Redirect www.reddit to old.reddit",
  "manifest_version": 2,
  "name": "oldReddit-redirect",
  "version": "0.1",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://www.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "redditRedirect.js"
    ]
  }
}