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Firefox hangs and freezes the moment i start it.

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  • Last reply by doomslyr

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Firefox hangs and freezes the moment i start it (9 out of 10 times it freezes). I have reinstalled it but still it freezes. I removed the antivirus (avira) and firewall (comodo) but no change. Can't even enter safe mode it hangs.

os win7 x64, amd fx 8350m 8gb ram, firefox version 20

Firefox hangs and freezes the moment i start it (9 out of 10 times it freezes). I have reinstalled it but still it freezes. I removed the antivirus (avira) and firewall (comodo) but no change. Can't even enter safe mode it hangs. os win7 x64, amd fx 8350m 8gb ram, firefox version 20

Modified by doomslyr

Chosen solution

@amitshree Thanks, though the softwares you listed did not catch anything, it hinted me towards a possible reason. The behavior blocker on my Comodo firewall was inactive... i activated it and instantly it caught something. A process by the name epym.exe. Not sure what it is/was. Comodo delete it and since then firefox is working like a charm :).

Thanks all :)

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


Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

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Chosen Solution

@amitshree Thanks, though the softwares you listed did not catch anything, it hinted me towards a possible reason. The behavior blocker on my Comodo firewall was inactive... i activated it and instantly it caught something. A process by the name epym.exe. Not sure what it is/was. Comodo delete it and since then firefox is working like a charm :).

Thanks all :)