Examine source code of Auto Old Reddit

{
  "manifest_version": 2,
  "name": "Auto Old Reddit",
  "version": "1.1resigned1",
  "description": "Automatically switches from *://www.reddit.com/* to *://old.reddit.com/* thereby reinstating the old style & custom css.",
  "icons": {
    "48": "icons/oldMain-48.png",
    "96": "icons/oldMain-96.png",
    "512": "icons/oldMain-512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*"
      ],
      "js": [
        "AutoOldReddit.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b876be03-ee0b-4764-a6c6-5689c0c937e0}"
    }
  }
}