Download Firefox Systems and Languages What's New Privacy Performance and connectivity Crashing and slow performance Troubleshoot issues with app crashes or slow performance. Сите All articles and threads Crashing and slow performance Site breakages In English Firefox blocked by macOS 15 Sequoia firewall - What you need to know Firefox won't start - find solutions Mozilla Crash Reporter Firefox crashes - asking for support Updating processor microcode Crash on Broadwell-U with old microcode Troubleshoot Firefox crashes (closing or quitting unexpectedly) Firefox keeps crashing at startup