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When I try to open firefox it says an update is ready to apply, but when I click ok it says it can not because firefox is already running.

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  • Last reply by cor-el

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When I double click Firefox it says an update is ready to be applied. Would you like to apply it now? I click yes and a green bar starts to fill, at about 3/4 it beeps twice it says it could not be completed because another instance of Firefox is already running, please close it and retry. However, the only program my task-manager shows is the update.

When I double click Firefox it says an update is ready to be applied. Would you like to apply it now? I click yes and a green bar starts to fill, at about 3/4 it beeps twice it says it could not be completed because another instance of Firefox is already running, please close it and retry. However, the only program my task-manager shows is the update.

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Did you check the Processes tab in the Task Manager?

You may also have other (security) software that is having a file handle open on some of the files.
In that case you may need to download the full version and delete the Firefox program folder before installing that downloaded update.

  • Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
  • It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.


Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

  • Shockwave Flash 10.0 r32

Update the Flash plugin to the latest version.