Portable Firefox 52 -

Avoid for everyday browsing. Only keep a copy on a USB stick for very specific legacy tasks, and never enter passwords or personal data. For modern portable browsing, use Portable Firefox ESR 115 (still gets updates) or Portable Chrome .

✅ No installation, leaves no registry traces, can be carried on a USB stick. Uses far less RAM than modern browsers (helpful on old hardware). portable firefox 52

If you absolutely need legacy extensions, consider running or Basilisk instead – they offer similar old-extension support but with some ongoing security patches. Avoid for everyday browsing

✅ If you’re stuck with Windows XP, Vista, or 32-bit Linux without updates, FF52 is one of the last modern-ish browsers that runs there. leaves no registry traces