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Firefox crashes on start

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New Contributor

Firefox crashes on start

Since upgrading to Firefox 18, I have been unable to start Firefox, even in Safe Mode. I have deleted my user profile and reinstalled Firefox twice. Clearing the user profile causes Firefox to offer to import from Internet Explorer, which I decline, after which is crashes. Subsequent starts result in crashes as well.

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6 REPLIES
Site Moderator

Re: Firefox crashes on start

If you can't open Firefox then see:

See also:


Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:

New Contributor

Re: Firefox crashes on start

Firefox 18.0.1 runs under safe mode, but once I reboot into "normal" mode, it begins crashing again.

Site Moderator

Re: Firefox crashes on start

If you have submitted crash reports then please post the IDs of one or more crash reports that have this format:

  • bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

You can find the IDs of the submitted crash reports on the about:crashes page.

  • You can open the about:crashes page via the location bar, like you open a website.

See:


Which security software (firewall, anti-virus) do you have?

If it works in Windows Safe mode then you have a problem with other software, likely security software or a system driver, that is running on your computer.
Make sure that you have the latest updates of your security software.

You can use the Autoruns utility to see which software and services gets started.

New Contributor

Re: Firefox crashes on start

Here are the crash reports I have submitted: bp-1c85bd40-cc52-44f0-82c6-759fc2130131 bp-333cce79-20cf-4669-9b7b-53ba22130131 bp-555e2095-0d9f-4f7e-ba74-7726a2130131 bp-ab12b1f6-af03-49fe-a73b-80e7a2130131

I have little reason to believe this computer is infected. I am running McAfee Enterprise 8.8i with the AntiSpyware plugin. I've also performed scans with Windows Defender and Malwarebytes Antimalware, which detected nothing that would interfere with the browser start (such as a malicious service or plugin).

Site Moderator

Re: Firefox crashes on start

This crash is caused by Websense Endpoint. Please contact them as you need to update your installation of Websense to fix this issue. They can assist you with that process.

New Contributor

Re: Firefox crashes on start

That makes sense. Thanks for the update.