✅ 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.
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 . portable firefox 52
✅ No installation, leaves no registry traces, can be carried on a USB stick. Uses far less RAM than modern browsers (helpful on old hardware). ✅ If you’re stuck with Windows XP, Vista,