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 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.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration or the JavaScript JIT compiler is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do not click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy

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

• http://support.kaspersky.com/viruses/solutions?qid=208280684

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Crash ID: bp-37900a9b-0d09-465c-a243-ed7792120929
Crash ID: bp-3de57ff4-a5bc-4dce-8209-9508b2120929
Crash ID: bp-79f26a6e-f333-4f64-81c4-b18f12120929
Crash ID: bp-09e5caff-faf9-48a9-a3e0-cb7122120929
Crash ID: bp-585176ed-41a1-4843-8d5f-66c3c2120927

Nightly 18.0a1 on Windows 7 64-bit. Crashes upon launch. Also crashes when launching using -safe-mode command line parameter. Uninstalled Nightly, cleaned registry and filesystem of all I could find, rebooted Windows, reinstalled Nightly... same problem. Generated three crashes just now for this post.

Crash ID: bp-5a50a13d-ebe9-48b1-b317-728d82121001

Crash ID: bp-2527810b-bf0f-4271-b52a-e2ad42121001

Crash ID: bp-a436234c-e8c3-443b-9bd3-67cb82121001

That is a known issue with yesterday Nightly build.

Try to update manually to today's build (there has been a respin to fix this).

• ftp://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/

You can also check the daily threads on the MozillaZine forum.

• http://forums.mozillazine.org/viewforum.php?f=23

• bug 795594 - Startup 64-bit crash in mozilla::layers::LayerPropertiesBase::LayerPropertiesBase

I must've just missed the new update... I had manually installed from 'latest trunk' 64-bit installer dated 9/30/12. Just now manually installed from same location installer dated 10/1/12 and this one worked. Thank you!