A fork of my own repo CopilotSidebar.
This extension is Firefox-only for now. You can find many alternatives available for Chromium-based browsers (Chrome, Opera, Brave).
Open ChatGPT while browsing with this nifty simple toolbar extension.
No user data is collected. Requests are sent via HTTPS from your browser directly to Copilot's server. No middle-man or third-party servers involved.