Examine source code of Oldereddit

{
  "manifest_version": 2,
  "name": "Oldreddit",
  "version": "1.0",
  "description": "Returneth ye olde Reddit. Redirects www.reddit.com to old.reddit.com.",
  "icons": {
    "48": "icons/old.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://www.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "old.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{abf23849-d095-4154-8242-e664b6ddfbae}"
    }
  }
}