Examine source code of Replit RPC

{
  "manifest_version": 2,
  "name": "Replit RPC",
  "version": "1.1",
  "description": "Show off your current project on Discord!",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "*://replit.com/*/*"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "*://replit.com/*"
  ]
}