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.
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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.
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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.
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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.
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Updating processor microcode
Processor bugs may cause crashes. Microcode updates address processor bugs.
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Crash on Broadwell-U with old microcode
Intel Broadwell-U processors need a microcode update to avoid Firefox crashes
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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.
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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.
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