Examine source code of Disable Reddit Hovercards

{
  "manifest_version": 3,
  "name": "Disable Reddit Hovercards",
  "version": "1.0",
  "description": "Disables user and subreddit hovercards on Reddit.",
  "browser_specific_settings": {
    "gecko": {
      "id": "disable-reddit-hovercards@example.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}