Examine source code of Roblox 2019

{
  "manifest_version": 2,
  "name": "Roblox 2019",
  "description": "Brings back the 2019 Roblox website",
  "version": "1.3",
  "author": "ComplexxBrian",
  "content_scripts": [
    {
      "matches": [
        "*://*.roblox.com/*"
      ],
      "js": [
        "roblox.js"
      ]
    }
  ],
  "permissions": [],
  "icons": {
    "16": "icon-small.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Roblox 2019",
    "default_icon": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a53cc8cc-9dfb-4ec3-bdcf-95cc85aeb1e6}"
    }
  }
}