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Out of nowhere Firefox stopped working. When I start Firefox that main window pops up with my bookmarks visible but my homepage doesn't, the window is blank. When I try to click in the window the title bar says "not responding". When I click on Details it shows the following error message:


 A problem caused this program to stop interacting with Windows.

Problem signature:

 Problem Event Name:	AppHangB1
 Application Name:	firefox.exe
 Application Version:
 Application Timestamp:	518ec3cc
 Hang Signature:	337e
 Hang Type:	1
 OS Version:	6.1.7601.
 Locale ID:	1033
 Additional Hang Signature 1:	337e2e97cafd6c9fa279a54a8c89e8aa
 Additional Hang Signature 2:	9ffe
 Additional Hang Signature 3:	9ffe31d768dc3953ccf21daee671146b
 Additional Hang Signature 4:	cc79
 Additional Hang Signature 5:	cc794925a0fcac252c4b2ebc413fc29b
 Additional Hang Signature 6:	c156
 Additional Hang Signature 7:	c1568438768b188420c05cfb9ff060b9

I tried booting into Safe made, Firefox works! I tried uninstalling, rebooting, reinstalling, rebooting, same error as above. No new programs have been installed in months and no new Windows updates. I have Windows Update off.

Any ideas on how to fix this? I don't want to go back to Internet Explorer!

Additional System Details


  • User Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

More Information

  • Top 10 Contributor
412 solutions 4875 answers
  1. Problem with your Addons or Toolbars, Remove your unwanted toolbars/Addons
  2. Check your Addons are updated!

In order to uninstall a possibly unwanted extension, please do the following:

  1. From the Firefox window click the Firefox button at the top left and select Add-ons, or, if the Firefox button is not shown, click the Tools menu and click Add-ons.
  2. Once the Add-on Manager has opened in a new tab, click the Extensions button on the left side of the window.
  3. You should now see a list of your installed extensions on the right side together with buttons on the right side of each extension.
  4. To remove an extension from Firefox, simply click the Remove button. You should see a message that informs you about the successful removal of the add-on.
  5. Note that some add-ons require a Firefox restart to be removed completely. To perform a Firefox restart after the add-on removal, click the Restart now link in the message.

You can find further information about uninstalling extensions in the following articles:

Disable or remove Add-ons

Remove a toolbar that has taken over your Firefox search or home page

Question owner

I disabled everything, same problem. When I click on the Firefox icon it asks me if I want to start in safe mode, I do that but nothing happens. However, If I click on the link to this page from my email it asks if I want to start in safe mode, that works! So I can open it in safe mode from a link but every other way locks it up. Very frustrating.

  • Top 10 Contributor
  • Moderator
10739 solutions 96645 answers

If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:

  • 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, or open this page via "Help > Troubleshooting Information".


  • Top 10 Contributor
  • Moderator
10739 solutions 96645 answers

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

You can use the MSConfig program or the Autoruns utility to see which software and services are getting started.

Question owner

Hi Cor-el,

I have tried booting the computer into safe mode, when I do Firefox runs fine.

There is no crash report, when I click on Firefox the Firefox windows pops up with the headers and bookmarks but a blank screen in the window. If I click in the window Firefox grays out and says "Not Responding" in the title bar.

Like I said, nothing changed on my computer. Firefox had been running great since February. I shut down one day and the next this whole issue started. I believe it was after Firefox updated itself to version 20. Version 18 and 19 were fine. When I reinstalled I tried 21 which is the version I'm now troubleshooting.

Any ideas?

  • Top 10 Contributor
  • Moderator
10739 solutions 96645 answers

Which programs are started by default if you check that with MSConfig?

Helpful Reply

Well I got it working. It is Adobe Flash Plug-In that is killing Firefox. I uninstalled Flash then Firefox worked. I tried reinstalling Flash, Firefox stopped working, I uninstalled Flash again and Firefox now works. But now I have no Flash!!!

Is this a known issue with Firefox and Flash? Any idea when they will be compatible again?