Examine source code of Old Reddit Redirect

{
  "manifest_version": 2,
  "name": "old_reddit_redirect",
  "version": "1.0",
  "description": "Redirects from every reddit.com page to the identical old.reddit.com version.",
  "icons": {
    "48": "old_reddit_icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/*"
      ],
      "js": [
        "old_reddit_redirect.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "agetzow@gmail.com"
    }
  }
}