One instance is already running error!

Asked By hamzarao 10 points N/A Posted on - 10/02/2011

Sometimes, when I open my Firefox, it shows me an error like this "an instance of Firefox is already running". I have no Firefox open on my taskbar. Can anyone help?

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• Question Category: Firefox

Best Answer by ManyJacobs

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Answered By ManyJacobs 0 points N/A #85246

One instance is already running error!

Hi friend!

May be your other Firefox is running in the background. There is no such an option to run Firefox at background position automatically. Though you can check this out. Go to run and write “msconfig” then press enter.

Here in startup tab, uncheck any option related Firefox, if any, and there is no more problem in running two Firefox at the same time. Another reason could be viruses. Your computer might be corrupted by virus. So, you need to update antivirus and scan full your computer. Just uninstall Firefox and then run a cleaner. You may use cc cleaner, Reginout cleaner, etc. And restart your computer. Then install Firefox 3.06. It will never create that kind of problem.

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• Posted on - 10/02/2011
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Answered By Sharath Reddy 590495 points N/A #292252

One instance is already running error!

That’s right. One of the possible reasons why Mozilla Firefox prompts you with that message is if the browser is already running in the background. You can check it from the Windows Task Manager by pressing CTRL + SHIFT + ESC on your keyboard.

The main executable of the Mozilla Firefox web browser is “firefox.exe” and if you see it in the task manager then that means the browser is already running. Normally, when you exit Mozilla Firefox that executable will disappear from the task manager.

But if that executable is already running in the background even if you didn’t launch the browser manually, try checking your Windows startup for an instance of the Mozilla Firefox web browser. Click “Start”, “All Programs”, “Accessories”, and then “Command Prompt”. In the command prompt window, type without quotes “msconfig” then hit Enter. In the “System Configuration Utility” window, select “Startup” tab.

If you happen to see Mozilla Firefox among the startup programs, uncheck it and click “OK” and then restart your computer. Another way without going to the “msconfig” utility is to uninstall and reinstall Mozilla Firefox.

It will not go back to the Windows startup the next time you install it because the browser is not designed to start with Windows and it doesn’t have an option either that will allow a user to start the browser when Windows is booting. To download the latest, go to Firefox Free Download.

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• Posted on - 03/24/2017
• Question Category: Firefox