Examine source code of OldRedditMe Public

{
  "manifest_version": 2,
  "name": "OldRedditMe Public",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "OldRedditMePublic@example.com"
    }
  },
  "description": "Forwards you to old reddit if it sees www.reddit.com",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "oldreddit.js"
      ]
    }
  ]
}