Performance and connectivity
Crashing and slow performance
Troubleshoot issues with app crashes or slow performance.
Firefox blocked by macOS 15 Sequoia firewall - What you need to know
Some macOS 15 users may have Firefox blocked by the firewall. Learn about the issue and how to help Mozilla investigate.
Last updated:
Firefox won't start - find solutions
This article explains what to do if the Firefox window does not open or you get an error message when you try to start Firefox.
Last updated:
Firefox crashes - asking for support
If nothing in the documentation seems to resolve issues with a Firefox crash, our community support forum volunteers may be able to help.
Last updated:
Updating processor microcode
Processor bugs may cause crashes. Microcode updates address processor bugs.
Last updated:
Mozilla Crash Reporter
The Mozilla Crash Reporter dialog box appears when Firefox crashes and lets you send a crash report. Learn how it works and how to access your crash reports.
Last updated:
Crash on Broadwell-U with old microcode
Intel Broadwell-U processors need a microcode update to avoid Firefox crashes
Created:
Troubleshoot Firefox crashes (closing or quitting unexpectedly)
Learn how to troubleshoot and fix Firefox crashes, and find out how to get more help if you're having problems solving the issue.
Last updated:
Firefox keeps crashing at startup
If Firefox keeps crashing when you try to start it and other solutions don't work, a clean reinstall can often fix the problem.
Last updated:
