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Firefox 24 crashes on startup, even in Safe mode

  • 8 replies
  • 6 have this problem
  • Last reply by Maynard25

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I've just updated to Firefox 24 Beta on Windows 7 and can no longer access the browser (even in safe mode). It crashes before actually opening the browser each time.

I've had trouble in the past triggered by the WebSense filtering tool in place on my company network (I think Firefox 17 wouldn't open either until WebSense was updated - it's been fine since then though), but I'm not sure if this is related at all.

My latest Crash ID is: bp-4cad81ba-839d-4cfa-aef3-3c5cd2130819

All Replies (8)

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can you attempt to launch firefox in the profile manager and or in windows safe mode? see the links below.

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Nothing. Gonna check crash ID.

Modified by Marc Sances

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I found out this from your error code: if self.exceptionCode == win32.EXCEPTION_PRIV_INSTRUCTION:

           return ("Exploitable", "PrivilegedInstruction", "A privileged instruction exception indicates that the attacker controls execution flow.")

Try to scan your computer with antimalware.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

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

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

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

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Try to disable hardware acceleration in Firefox.

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Thanks for the suggestions. Safe mode didn't help, but disabling hardware acceleration has done, and I can now get in to Firefox.

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I believe my problem started with FF 24 Beta 4, and it persists into Beta 5. [Windows 7 fully patched.]

Firefox would start and was not technically locked up but the menus, controls and dialog boxes would not paint. I could actually press the 'missing' Ok, button when I tried to stop it and it asked for confirmation.

Starting in Safe Mode worked so I suspected an Add-On. After disabling more than half of my add-ons it still exhibited the same behavior.

Disabling hardware acceleration as suggested above DID WORK and FF runs fine. (I have not yet re-enabled the remainder of my add-ons.)

Knowing this might help someone else.


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I have having a horrific time with Firefox 24 crashing. I have run many anti-virus, tried suggestions on here. Then I decided to run the ADS Spy tool in the Misc. Tools that come with Hijack This from Trend Micro.

The results showed four supposed "Microsoft" folders, that were odd. I am familiar with Microsoft folder types but these were very odd, not only because of where they were, but also because when I tried to find them in the detected location, they were not there!! And I DO have "Show Hidden Files and Folders" enabled.

I looked all over for the folders, inside EVERY other Microsoft folder in "Applications", both in the "All Users" and the personalized one that is also found there as well as in Local Settings. They weren't there either. They were detected as being in: Docs and Settings > Local Users > Applications > Microsoft then named as, (not exact names, I forgot to write them out but these are representative of those names):

  • yv9d0fkyxb4e
  • vq5stu20izqm
  • u3vxf7d5wrk8
  • qo0c6ep2vvi1

These are usually the kinds of names tagging viruses/trojans. And I keep close tabs on what is inside folders, I've learned over time to do that, not just rely on antivirus software. It has paid off more than a few times. But these kind of names are usually found as some kind of text files if it's a virus. And I KNOW that they were not there before. I had run ADS Spy about two weeks earlier. With names like that I would have seen them as obviously suspicious.

So.... I deleted them from Hijack This when they were found in a second scan for ADS Spy entries, and once again I could not find them anywhere.

Since then my computer has been working perfectly as has Flash Player and Windows Media Player. Not one crash or glitch and I am on my computer all day and night until bed

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Try uninstalling .NET Framework 3.5 entirely.


Reinstall .NET Framework 3.5 and updates

Solved the problem of both Internet Explorer, Firefox 24, AND Flash Player constantly crashing. Learned about the problem from a neighbor's son who is a Tech. It worked.