Examine source code of always-old-reddit

{
  "description": "Always redirect to old.reddit.com",
  "manifest_version": 2,
  "name": "always-old-reddit",
  "version": "1.0.2",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://*.reddit.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}