I will flag this as escalate, as I do not understand the crash. Hopefully someone will reply within a few days. (HelpDesk staff may take 2-3 days and do not work weekends )

For forum cross referencing purposes + my observations

• Reports for your CrashIDs
  bp-84f387ee-c576-449a-b00c-d0ccc2150215
  bp-fc5c2d5b-1d26-4131-8e55-3865c2150215
• Crash Signature: StrChrIA
  • 7 days https://crash-stats.mozilla.com/report/list?product=Firefox&signature=StrChrIA#tab-sigsummary
• related bugs (old)

  bug 627238 RESOLVED WORKSFORME blocklist CbFsMntNtf3.dll 3.0.77.30 to stop crashes [@ StrChrIA] caused by eldos Callback File System
   bug 547588 RESOLVED DUPLICATE crash in private mode [@ StrChrIA ]
   bug 530074 NEW --- Crash [@ StrChrIA ] from winsock and shlwapi.dll (LSP, evil *x86.dll module)

I find it rather odd the signature 7 day summary is picking up >1000 Win7 crashes & >1000 Fx35.0.1 crashes but did not see this in the default top crash listing, its only showing currently as #59

General suggestions that may help. Try testing

1. Using a new additional Firefox profile
   Profile Manager - Create, remove or switch Firefox profiles
2. Using Windows 7's safemode
   http://windows.microsoft.com/en-gb/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7
3. After a clean reinstall of Firefox. involving deleting the program files (Not the profile files) _{Firefox keeps crashing at startup}_try-a-clean-install

The related bug, 530074 NEW --- Crash [@ StrChrIA ] from winsock and shlwapi.dll (LSP, evil *x86.dll module) and the linked /questions/982811 indicate the problem may be other installed software or malware.

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 Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

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

For more information see the Troubleshoot Firefox issues caused by malware article.

So I am going to scan for malwares now as per your suggestion. I will revert once the scanning is done. Thanks for your replies guys. ps-last time I had faced the same problem, someone here told me to do the same thing, malware scan. Then they told me that a certain software's .dll file was causing the crash. I uninstalled that sw and removed that dll but the problem kept on. Are we going down the same path?

Thanks Alice, I gave up on seeing the number of comments

phatak.sujit

Your last thread was about the same crash signature

• FF keeps crashing over and over again for many websites after updating it to 34.0.5 /questions/1038050 bp-f5232609-0566-4a90-854b-6d6702141224

It seems you have similar crashes still. I will post a comment in the bug, see if any of the experts come back with any useful tips. Meanwhile it seems malware scans are sensible.

Drew a blank with the bug comment. I did get a reply, but I had hoped someone would have further information now the frequency of the crash signature is climbing again, that appears not to be the case.

We contacted several affected users and the commonality between them is a program called Gutscheinfilter or G-Filter, from gutscheinfilter.de.
The G-Filter installer writes two exe files in System32 and registers them as Windows services. The first is usually called gfiltersvc.exe though we have also seen gfiltersvc0.exe. The second file has a random name, chosen by taking the name of a nearby dll in System32 and mutating one character. The random file can be identified by its timestamp which is very close to that of gfiltersvc.exe. Also, the two services can be identified by their blank description in the Windows services manager.

I doubt you will have any file with a name including the letters gfiltersvc but it would be worth searching your computer making sure you include system and hidden files.

It is probably some malware related to the original but either not as common, or if you are lucky something that is detectable and being kept at bay by AV software & malware scans.

Did you try all those scans and what did they report ?

P.S. If you do find malware it may be good to quarantine it but not delete it just yet.

The bug mentioned in the report that is not closed and has not been worked on.

If you have an antivirus, please make sure that they are up to date, as suggested they may have already started to block the culprit mentioned by John99^

Other suggestions I can make here are: Try a beta version or another profile. Profile Manager - Create, remove or switch Firefox profiles