This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox Windows 10 64 bit does not start

  • 4 replies
  • 2 have this problem
  • 13 views
  • Last reply by FredMcD

more options

Event viewer shows this : Fault bucket 120815822907, type 4 Event Name: APPCRASH Response: Not available Cab Id: 0

Problem signature: P1: firefox.exe P2: 55.0.2.6435 P3: 5991c5a9 P4: ntdll.dll P5: 10.0.15063.447 P6: a329d3a8 P7: c0000005 P8: 000000000001f8cc P9: P10:

Attached files: minidump.mdmp \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2A6.tmp.WERInternalMetadata.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2B9.tmp.csv \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2DA.tmp.txt

These files may be available here: C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_firefox.exe_77fdf8eb4e818bb41d4470b14188a07ade1653c6_8b2538e4_2688ca76

Analysis symbol: Rechecking for solution: 0 Report ID: 4f4e1f17-c529-41f9-ba24-ced665712ff9 Report Status: 268435456 Hashed bucket: b7a8525ad4aa90b894badb58e6ce4cd1

Faulting application name: firefox.exe, version: 55.0.2.6435, time stamp: 0x5991c5a9 Faulting module name: ntdll.dll, version: 10.0.15063.447, time stamp: 0xa329d3a8 Exception code: 0xc0000005 Fault offset: 0x000000000001f8cc Faulting process ID: 0x25c0 Faulting application start time: 0x01d319dcd0766ea3 Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll Report ID: 4f4e1f17-c529-41f9-ba24-ced665712ff9 Faulting package full name: Faulting package-relative application ID:

I have cleaned my PC from Malware with several tools and I use Bitdefender as my Antivirus Tried several installs never got it to work

Thanks fot helping me out

Event viewer shows this : Fault bucket 120815822907, type 4 Event Name: APPCRASH Response: Not available Cab Id: 0 Problem signature: P1: firefox.exe P2: 55.0.2.6435 P3: 5991c5a9 P4: ntdll.dll P5: 10.0.15063.447 P6: a329d3a8 P7: c0000005 P8: 000000000001f8cc P9: P10: Attached files: minidump.mdmp \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2A6.tmp.WERInternalMetadata.xml \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2B9.tmp.csv \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WERC2DA.tmp.txt These files may be available here: C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_firefox.exe_77fdf8eb4e818bb41d4470b14188a07ade1653c6_8b2538e4_2688ca76 Analysis symbol: Rechecking for solution: 0 Report ID: 4f4e1f17-c529-41f9-ba24-ced665712ff9 Report Status: 268435456 Hashed bucket: b7a8525ad4aa90b894badb58e6ce4cd1 Faulting application name: firefox.exe, version: 55.0.2.6435, time stamp: 0x5991c5a9 Faulting module name: ntdll.dll, version: 10.0.15063.447, time stamp: 0xa329d3a8 Exception code: 0xc0000005 Fault offset: 0x000000000001f8cc Faulting process ID: 0x25c0 Faulting application start time: 0x01d319dcd0766ea3 Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll Report ID: 4f4e1f17-c529-41f9-ba24-ced665712ff9 Faulting package full name: Faulting package-relative application ID: I have cleaned my PC from Malware with several tools and I use Bitdefender as my Antivirus Tried several installs never got it to work Thanks fot helping me out

All Replies (4)

more options

If you have submitted crash reports then please post the IDs of one or more recent crash reports that start with "bp-".

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

You can find the report ID of recent crash reports "on the "Help -> Troubleshooting Information" (about:support) page".

  • click the "All Crash Reports" button on this page to open the about:crashes page and see all crash reports.

Alternatively you can open about:crashes via the location/address bar.

See also:

more options

I do net get to a "crash" stage. When I click the FireFox button the system goes busy for a few seconds and nothing happens .... This is why I have send the Windows Event viewer data.

Thanks

more options

Let’s do a full clean re-install; Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Do Not remove the profiles folder.

Look for, and rename any Mozilla or Firefox program folders by adding .old to them. Do not rename the Mozilla Thunderbird folder if there is one.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. If all goes well, remove the OLD folders when you are done. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

more options

Note: V55 has been giving users problems. Reinstall v54.

https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release https://www.mozilla.org/en-US/firefox/organizations/ https://www.mozilla.org/en-US/firefox/organizations/notes/ https://www.mozilla.org/en-US/firefox/organizations/system-requirements/