Examine source code of ChatGPT Carbon Tracker

{
  "manifest_version": 3,
  "name": "ChatGPT Carbon Tracker",
  "version": "1.0",
  "description": "Track the carbon footprint of your ChatGPT conversations in real-time",
  "icons": {
    "16": "assets/icon.png",
    "48": "assets/icon.png",
    "128": "assets/icon.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icon.png",
      "48": "assets/icon.png",
      "128": "assets/icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@GPT.carbon-tracker"
    }
  },
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "https://chatgpt.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}