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After trying all remedies I still get Application Error Instruction at 0x05010000 reference memory at 0xf9cb057c memory could not be read, give me recommendatio

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  • Last reply by cor-el

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After opening firefox I get the error message application error instruction at 0x5010000 reference memory at 0xf9cb057c memory could not be read. If I click on ok or cancel to debug it shuts me out of firefox and I can't get back on. I have done the things recommended.

After opening firefox I get the error message application error instruction at 0x5010000 reference memory at 0xf9cb057c memory could not be read. If I click on ok or cancel to debug it shuts me out of firefox and I can't get back on. I have done the things recommended.

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What XP service pack do you have installed?

You need at least SP2.


Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

  • Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

If you keep having problems then create a new profile to test if your current profile is causing the problem.


Modified by cor-el