Examine source code of Robux Devex Viewer

{
  "manifest_version": 2,
  "name": "Robux Devex Viewer",
  "short_name": "Robux USD Converter",
  "version": "1.2",
  "description": "Modify Robux value on the Roblox website.",
  "permissions": [
    "https://*.roblox.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.roblox.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{432133df-dbd2-47c1-8531-e92e9336851f}"
    }
  }
}