Mozilla Firefox includes a safe mode startup option. Firefox doesn’t use extensions, themes, hardware acceleration or your custom settings when you start in safe mode. You can start Firefox in safe mode by pressing and holding the “Shift” key while clicking the “Firefox” shortcut. Click “Continue in Safe Mode” when the dialogue box appears. If Firefox doesn’t crash when you start in safe mode, the problem is with your Firefox configuration.
Firefox crashes can be caused by incompatible extensions or themes, issues with hardware acceleration and the drivers on your system, problems with your Firefox settings and other issues. If Mozilla Firefox is crashing every time you reopen it, you can troubleshoot Firefox with its safe mode, update the software on your system or create a new Firefox profile.
If Firefox starts without crashing in safe mode, you can make some of the safe mode changes permanent. Close Firefox and restart it in safe mode again. Use the dialogue box that appears to select one of the options such as “Disable All Add-ons” or “Reset All User Preferences to Firefox Defaults” and click “Make Changes and Restart” to restart Firefox in normal mode with the changes. After restarting, you can re-enable extensions and themes one by one and install updated extensions that may fix the problem.
If Firefox crashes safe mode, updating Firefox and other software on the system may fix the problem. You can download and install a new version of Firefox from Mozilla.com if it won’t start. You should also update Windows from Windows Update, update any browser plug-ins such as Adobe Flash and update for your antivirus, firewall and other security programs. The crash may be fixed with newer versions of the software.
Firefox stores your settings in a profile directory. It normally creates only one profile directory, but you can create an additional profile and start Firefox with that profile instead of using safe mode. Close Firefox if it’s open, click “Start,” type “Firefox.exe -ProfileManager” into the search box in the Start menu and press “Enter” to access the profile manager window. Click “Create Profile” to create a new profile, provide a name for the new profile and click “Start Firefox.” Firefox opens with a fresh profile; you can start your old profile from the profile manager window.
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