How-To Geek

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

The above message was played on my pc yesterday (May 31) when I clicked the icon to get on the internet, & I can no longer use Mozilla Firefox. This happened twice last year, but restarting the computer solved the problem. This time, I've restarted, rebooted, shut down, unplugged, uninstalled, reinstalled, deleted, shut off, begged, yelled...nothing works. My pc tells me that Firefox is still running, & so does any other browsers I've tried. I can get on the internet, but I like Firefox better--I can't transfer my bookmarks, etc because my current browser says Firefox is still running. How do I close it? How do I prevent it from happening again if anyone has an answer to this? HELP!!!!!

Hi Captainbars: click CTRL+ALT+DEL you will get a menu, click on START TASKMANAGER, click on PROCESSESS tab, scan the entries. You should find one or more of firefox.exe entries. Click on each and click END PROCESS. Now close task manager, and restart firefox. It should run.

I would also rum this MBAM to check if the computer is clean.

If you cannot get on the net use another computer to download it to a usb stick then put MBAM on your computer install update and run a scan

Use the free version http://www.malwarebytes.org/

Hi,

Follow the steps to given below:
In Windows Vista If you are receiving the above error message while attempting to start Firefox, try to restart the program. If the problem persists, do the following:
1. Restart your computer.
2. Select the Start Menu in the Windows Taskbar.
3. In the Search box, enter the following:
%APPDATA%
4. Press Enter.
5. From the Application Data folder, navigate to Local\VirtualStore\Program Files\Mozilla Firefox.
6. Delete the file xpicleanup.dat.
7. Restart Firefox.
In Windows XP
1. Click on the Start button and select Search to open the Search Results window.
2. On the left side of the Search Results window, click on the All files and folders link.
3. Click to expand the More advanced options list.
4. Put a check mark next to Search system folders, Search hidden files and folders, and Search subfolders.