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2nd day trying to access firefox. task mgr processes doesn't show it but under details it shows it. when i click to end task i get access denied

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I can't access firefox after crash. I get msg to close firefox. task mgr under 'processes' doesn't show it as running but when I click on 'details' in task mgr it shows firefox.exe as running. I right click on that & click to end task. I get back a window with a red x saying access denied. I am running windows 10.

some people sent me emails to fix the problem but nothing helps. don't know why it wont end the task/process in task mgr under the heading details. under the heading processes it doesn't show it all as running. I want to stay with firefox but it's getting very difficult to do that.

I can't access firefox after crash. I get msg to close firefox. task mgr under 'processes' doesn't show it as running but when I click on 'details' in task mgr it shows firefox.exe as running. I right click on that & click to end task. I get back a window with a red x saying access denied. I am running windows 10. some people sent me emails to fix the problem but nothing helps. don't know why it wont end the task/process in task mgr under the heading details. under the heading processes it doesn't show it all as running. I want to stay with firefox but it's getting very difficult to do that.

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Do a malware check with several malware scanning programs on the Windows computer.

Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:


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\"
  • (64 bit Windows) "C:\Program Files (x86)\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.