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.
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.
If nothing in the documentation seems to help with a Firefox crash, the support forum can help. Here are some things to prepare before posting your question.
Processor bugs may cause crashes. Microcode updates address processor bugs.
Intel Broadwell-U processors need a microcode update to avoid Firefox crashes
Learn how to troubleshoot and fix Firefox crashes, and find out how to get more help if you're having problems solving the issue.
If Firefox keeps crashing when you try to start it and other solutions don't work, a clean reinstall can often fix the problem.