If updating software didn't work or if Firefox crashes on startup, use the steps below to test whether the crash happens in Firefox Troubleshoot Mode or not and then follow the instructions in the recommended articles.Ĭlick the menu button, click Help, select Troubleshoot Mode… and click Restart in the Restart Firefox in Troubleshoot Mode? dialog. For more information, see Identify problems caused by third-party modules in Firefox for Windows.Ĭheck to see if the crash happens in Troubleshoot Mode You may not notice that a malicious or unexpected module has been loaded, and it may cause problems that appear to be Firefox issues. Sometimes, these applications load harmful modules that cause Firefox crashes, reduced performance, or compatibility issues. Third-party applications (such as antivirus software, archiving software, and other tools) may load modules into Firefox. For more information, see Troubleshoot Firefox issues caused by malware. A number of different viruses and spyware are known to crash Firefox.

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