Examine source code of Old Reddit - Lock Comment

{
  "manifest_version": 2,
  "name": "Old Reddit - Lock Comment",
  "version": "1.0",
  "description": "Adds the ability for mods to lock comments to old reddit.",
  "icons": {
    "48": "icons/lock.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://old.reddit.com/*"
      ],
      "css": [
        "old_reddit_lock_comment.css"
      ],
      "js": [
        "old_reddit_lock_comment.js"
      ],
      "run_at": "document_end"
    }
  ]
}