We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.

1. Press the following shortcut to get a Run window: [Windows] + [R]. This should bring up a window that contains a text field.
2. In that text field, enter %APPDATA% and press Enter. An explorer window should open.
3. From that explorer window, double-click on the Mozilla folder, then double-click on Firefox and then on Crash reports. Double-click on submitted.
4. Now, you should see a list of files that contain reports. Go to View > Arrange Icons by > Modified to get the most recent files at the top of the window.
5. Open the most recent 5 files with a text editor and copy the IDs.
6. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Note that there is a crash ID in the System Details List.

• https://crash-stats.mozilla.com/report/index/d1e8871b-84ca-48b7-9467-3fc6a2130726

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.

bp-d1e8871b-84ca-48b7-9467-3fc6a2130726

This appears to be the crash ID

It does exactly the same thing when I boot in safe mode and run FF.

Here are the 5 most recent crash reports:

bp-6b7fe0b2-3f3e-4629-bc6f-c7f772130727 bp-53dc8d9c-9532-419e-b7ee-7aa0d2130726 bp-81de0209-2f24-44a6-abbf-a0bcc2130726 bp-1875d1d8-d4ae-48e6-a6a0-56ed72130726 bp-54056f96-cc53-4f18-a7c5-99ec02130727

Oh BTW, thunderbird just crashed (a first for me) but it seems to have recovered.

Thanks, Ken

have you booted into safe mode, it may be a cause of your antivirus or a driver

Running in safe mode (or as administrator for that matter) made no difference.

I mean windows safe mode not firefox safe mode

• http://windows.microsoft.com/en-us/windows/start-computer-safe-mode

So did I. I booted in windows safe mode and it did exactly the same thing. K

also some startup crashes of firefox are due to malware

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

I've run everything and it all comes up clean. In addition, spybot always runs in the background. FF is the only program that has issues. BTW, MS security essentials is horrible antivirus software.