Donut Browser: Open Source Anti-Detect Browser With Unlimited Isolated Profiles
https://firethering.com/donut-browser-open-source-anti-detect-browser/

Donut Browser: Open Source Anti-Detect Browser With Unlimited Isolated Profiles - Firethering
If you've ever managed multiple accounts in the same browser, you've probably run into the usual mess. Wrong account logged in. Cookies bleeding between sessions and more. Donut solves that by treating every profile as its own browser. Create a profile, attach a proxy if you want, and it gets its own cookies, storage, extensions, fingerprint, and network settings. Open five profiles and it feels like you're using five separate browsers. Everything stays local. There's no account to create. You download the app, create profiles, and get on with your work. If you're managing client accounts, testing websites, keeping work and personal browsing apart, or building automation workflows through the local API, Donut gives you a clean way to keep identities separated without turning your browser into a headache.