When I try to launch Firefox I am told it is already running

I get this error message: 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. When I go to task manager/applications tab, nothing shows up, but when I go to task manager/processes tab, sure enough, it does look like it is running already. I went to msconfig and it does not appear that firefox is one of my startup jobs.
During shutdown, laptop has to do a forced shutdown sometimes because it says a job is still running (though I can not see one doing so). Again I go to task manager processes and there is Firefox, running invisibly again. What is up with this and how to I correct it?

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When I try and launch Firefox, I get this error message A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help?

When I try and launch Firefox, I get this error message >A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help? I thought if I were to completely uninstall and re install it might help, but I cannot seem to find instructions to do this....

See [[Firefox is already running but is not responding]], the image shown in that article is the Windows equivalent of the error message that you are receiving, but the information relates to the Mac.

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WhenI close firefox, and later when I try to open firefox again, it says it is already open, although it shows to be closed---don't know when it is closed or not, don't like this

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https://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit

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This started when I tried to update firefox. Have unistalled and reinstalled and cleared the registry but nothing is working.

The "System Tray" is located at the very bottom right of your screen and is a list of most/all running applications that will show in this list.
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Have noticed that after closing Firefox -- when I try to reopen it - get mesg that it is already running -- Am using vers. 6

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.

Must be the "hang at exit" problem. <br /><br />
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''
Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

I try to launch forefox but it says it is already running and will not load.

I try to lauch firefox but I get an error message saying that the programme is already running. I need to close the program and re-start. However the programme is not actually running.
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Check out the "Firefox Hangs" support article, section on "hang at exit": https://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit
I'm an XP user, so you might search around for threads by Vista users who might have suggestions on how to resolve this.
ADDED:
This article notes several other possible explanations, including malware: [http://kb.mozillazine.org/Firefox.exe_always_open Firefox.exe always open - MozillaZine Knowledge Base]

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Back up all data if you haven’t already done so. Before proceeding, you must be sure you can restore your system to the state it’s in now.
Launch the Terminal application in any of the following ways:
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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Drag or copy — do not type — the following line into the Terminal window, then press return:
sudo nvram boot-args=""
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Firefox keeps crashing when I try to launch it. I uninstalled the program, but now when I try to download it from your website the download freezes with 1 second left. This has happened several times.

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Hello Deb,
Something fishy going on with those particular files. But without looking at them directly I couldn't say what. Usually in a case like this the problem is some of the metadata that is attached to the file. Where did these files come from? A camera, a scanner, the internet?
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When I try to open Firefox, a pop up says it is already running and I must close a window or restart. I can not figure out how to close the window they are asking me to.

when I try to start Firefox, a pop up says it is already running and I must close a window or restart. I can not figure out what window they want me to close
== This happened ==
Every time Firefox opened
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; MDDC; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

See http://kb.mozillazine.org/Firefox_hangs and [[Firefox hangs]] (Hang at exit)
Check in the Task Manager (XP: Ctrl+Alt+Del, Vista: Shift+Ctrl+ESC, Processes tab) if there are hanging Firefox processes.
If you see any ''firefox.exe'' processes then click the End button to end those Firefox processes.
You can only start Firefox in [[Safe mode]] or launch the [[Managing profiles|Profile Manager]] is all Firefox processes are ended.
See also http://kb.mozillazine.org/Kill_application

When I try to launch Firefox I am told it is already running

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