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 crashes

more options

After following the steps found here(http://support.mozilla.org/en-US/kb/firefox-crashes-troubleshoot-prevent-and-get-help) with no luck. The crash doesn't occur when I open in Safe Mode. The crash will occur sporadicly - sometimes after a few hours, sometimes when the computer isn't being used (Itend to leave my machine running 24/7, and have come home/woke up to find Firefox has crashed when not being used).

After following the steps found here(http://support.mozilla.org/en-US/kb/firefox-crashes-troubleshoot-prevent-and-get-help) with no luck. The crash doesn't occur when I open in Safe Mode. The crash will occur sporadicly - sometimes after a few hours, sometimes when the computer isn't being used (Itend to leave my machine running 24/7, and have come home/woke up to find Firefox has crashed when not being used).

All Replies (6)

more options

That is a crash report from Firefox 9.0.1 with the Flash plugin.

Are you sure that the report is from the current Firefox version that you use and not an old one from the past (check the file date)?

If you installed an older Firefox version then please update to the current release.


Try to disable hardware acceleration in Firefox.

more options

The crash report I submitted is dated 2012-09-23 23:54:07. I am running Firefox version 15.0.1. I've already tried to disable the hardware acceleration, but the crashes still occur.

more options

If it does work in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

You can check for problems caused by recent Flash updates and try these:

  • disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer
  • disable protected mode in Flash 11.3 and later
  • disable hardware acceleration in the Flash plugin
  • downgrade to Flash 11.2 or 10.3
more options

It just crashed again, after I disabled ALL extensions & add-ons. So my next step will be to uninstall then reinstall Firefox. But before I do that, how do I save/copy/move my history & bookmarks so that I don't lose them when I uninstall???

more options

And as found in my "Troubleshooting Information", I am running version 15.0.1:


 Application Basics
       Name
       Firefox
       Version
       15.0.1
       User Agent
       Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0.1
       Profile Folder
         Show Folder
       Enabled Plugins
         about:plugins
       Build Configuration
         about:buildconfig
       Crash Reports
         about:crashes
       Memory Use
         about:memory
 Extensions
       Name
       Version
       Enabled
       ID
       DivX Plus Web Player HTML5 
       Microsoft .NET Framework Assistant
       0.0.0
       false
       {20a82645-c095-46ed-80e3-08825760534b}
       QuickFinder
       1.0
       false
       {E3D86202-CC7F-4870-8CCF-60319C0AF7BC}
       RealPlayer Browser Record Plugin
       15.0.6
       false
       {0153E448-190B-4987-BDE1-F256CADA672F}
       ZoneAlarm Security Engine
       1.5.350.0
       false
       {FFB96CC1-7EB3-449D-B827-DB661701C6BB}
 Important Modified Preferences
     Name
     Value
       accessibility.blockautorefresh
       true
       browser.cache.disk.capacity
       1048576
       browser.cache.disk.smart_size.first_run
       false
       browser.cache.disk.smart_size_cached_value
       532480
       browser.places.smartBookmarksVersion
       4
       browser.startup.homepage_override.buildID
       20120905151427
       browser.startup.homepage_override.mstone
       15.0.1
       extensions.lastAppVersion
       15.0.1
       gfx.direct2d.disabled
       true
       layers.acceleration.disabled
       true
       network.cookie.prefsMigrated
       true
       places.history.expiration.transient_current_max_pages
       83863
       privacy.sanitize.migrateFx3Prefs
       true
 Graphics
       Adapter Description
       NVIDIA GeForce GT 240
       Vendor ID
       0x10de
       Device ID
       0x0ca3
       Adapter RAM
       Unknown
       Adapter Drivers
       nv4_disp
       Driver Version
       6.14.11.9107
       Driver Date
       9-27-2009
       WebGL Renderer
       Blocked for your graphics driver version. Try updating your graphics driver to version 257.21 or newer.
       GPU Accelerated Windows
       0. Blocked for your graphics driver version. Try updating your graphics driver to version 257.21 or newer.
 JavaScript
       Incremental GC
       0
 Library Versions
       Expected minimum version
       Version in use
       NSPR
       4.9.1
       4.9.1
       NSS
       3.13.6.0 Basic ECC
       3.13.6.0 Basic ECC
       NSS Util
       3.13.6.0
       3.13.6.0
       NSS SSL
       3.13.6.0 Basic ECC
       3.13.6.0 Basic ECC
       NSS S/MIME
       3.13.6.0 Basic ECC
       3.13.6.0 Basic ECC

more options

Here's what I've tried so far:

I COMPLETELY uninstalled Firefox, including my personal data, restarted my computer, then reinstalled FF 15.0.1 (after doing the same but keeping my personal data, only to have it still crash). Well this didn't work as Firefox still crashed. I had no extensions or add-ons added, let alone enabled.