Examine source code of Roblox 2016 Reimagined

{
  "manifest_version": 3,
  "name": "Roblox 2016 Reimagined",
  "version": "1.1",
  "description": "Completely reworks the Roblox website to have the old 2016 style.",
  "icons": {
    "16": "icons/icon.png",
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon.png",
      "32": "icons/icon.png",
      "48": "icons/icon.png",
      "128": "icons/icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.roblox.com/*",
        "*://web.roblox.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "host_permissions": [
    "*://www.roblox.com/*",
    "*://web.roblox.com/*"
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "roblox2016@reimagined",
      "strict_min_version": "109.0"
    }
  }
}