Examine source code of i.redd.it Fixer

{
  "manifest_version": 2,
  "name": "i.redd.it Fixer",
  "version": "1.2",
  "description": "Removes the UI on i.redd.it and preview.redd.it, and replaces it with just the image and better zoom.",
  "content_scripts": [
    {
      "matches": [
        "https://i.redd.it/*",
        "https://preview.redd.it/*"
      ],
      "js": [
        "i.redd.it.fixer.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a22a07a2-c870-425e-8b06-f7afc761c4c9}"
    }
  }
}