CarbonPrompt is a Chrome (MV3) extension that estimates the carbon emissions of your AI prompts on chatgpt.com and visualizes session usage, a dashboard, and simple predictions.

• Node.js 18+ and npm installed
• Google Chrome (or Microsoft Edge)

1. Install dependencies:

npm install

2. Build the extension bundle:

npm run build

This creates the dist/ folder with:

• manifest.json and icons (copied via Vite static copy)
• popup.html (extension UI)
• background.js (service worker)
• contentScript.js (injected into chatgpt.com)

1. Open Chrome and go to: chrome://extensions
2. Enable “Developer mode” (top-right toggle)
3. Click “Load unpacked” and select the dist/ folder
4. Pin the extension icon if desired (Extensions menu → pin CarbonPrompt)

1. Navigate to https://chatgpt.com/
2. Start typing a prompt — you should see an on-page estimate overlay
3. Submit a prompt (click Send or press Enter) — the Session tab in the popup should accumulate CO₂
4. Open the popup to view:
   • Session bar (now uses 8g domain; target marker at 5g)
   • Dashboard (sample data only)
   • Predict tab (simple forecast and tips)

After making code changes:

npm run build

Then return to chrome://extensions and click “Reload” on CarbonPrompt.

• No overlay or accumulation:
  • Hard refresh ChatGPT (Ctrl+F5)
  • Ensure you’re on https://chatgpt.com/ (not openai.com). If needed, add host permissions for other domains in manifest.json.
• Popup shows 0g after closing:
  • Session total is persisted; reopen the popup and it will read sessionTotal from storage.
• Inspect logs:
  • Page console (ChatGPT tab) for CarbonPrompt:updateDailyEmissions messages
  • chrome://extensions → CarbonPrompt → “Service worker” → “Inspect views” for background/service logs

In Microsoft Edge, visit edge://extensions, enable “Developer mode”, then “Load unpacked” → choose dist/.

• Build uses Vite with React and TypeScript; output is in dist/ per vite.config.ts
• Storage keys: dailyEmissions, totalEmissions, sessionTotal, tokens, model
• Content script detects submits via click and Enter with a double-count guard