Examine source code of AdHole

{
  "manifest_version": 2,
  "name": "AdHole",
  "version": "1.0",
  "description": "Attempts to delete promoted in-line ad content within the old.reddit.com document object model.",
  "icons": {
    "48": "art/adhole.png",
    "96": "art/adhole96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://old.reddit.com/*"
      ],
      "js": [
        "/js/adhole.js"
      ]
    }
  ]
}