manifest.json

{
  "manifest_version": 2,
  "name": "ChatGPT Execute Code button",
  "version": "1.0.0",
  "description": "In ChatGPT, js code-blocks get a 'Execute Code' button, which allows js-code to be executed immediately in the context of the browser.",
  "content_scripts": [
    {
      "matches": ["https://chat.openai.com/*"],
      "js": ["content.js"]
    }
  ],
  "permissions": ["activeTab"],
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  }
}