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Fix npm run build failing due to ESLint errors - Fix Firefox Secure Connection Failed Due to Malware-Cloudflare 521 Error: Firewall Settings Fix

2026-07-28 18:13:57browser-issues
Fix npm run build failing due to ESLint errors - Fix Firefox Secure Connection Failed Due to Malware-Cloudflare 521 Error: Firewall Settings Fix

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.