Some times when I load Firefox, I get a message saying Firefox is already running. The only solution I have found is to reboot the system.

This happens when no other processes are running. Looks to me like their should be a option in the message to stop the running process.

Sounds like Firefox is "hanging at exit". 
#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]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#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]
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On a frequent basis when I go to open Firefox, I get a message saying it is already running and can't be opened. This happens on two of my XP computers. The only way I can open it is to restart the computer.

The details are in the question. I have to restart the computer to get Firefox to work a few times a week

I will try to always use "file - exit" to close it to see if that fixes the problem, but with older versions, X ing out worked OK all the time. Something may have changed with this later version.
Thank you

When I try to start Firefox, I get a message that it is already running but not responding and I can't run another Firefox at the same time. I uninstalled and reinstalled. No change. Tried various other suggestions. Help!!

When I try to start Firefox, I get a message that it is already running, but not responding and that I should close it before trying to run another Firefox. But I cannot find a way to close Firefox program that is not running as far as I can see. I tried uninstalling and reinstalling Firefox, but that did not work. I've tried various other things, but no luck. I thought programs should stop when the computer is turned off, but that didn't work either.

How are you opening the Profile Manager?
*http://kb.mozillazine.org/Profile_Manager
Sounds that Firefox is still or already running. 
See:
*http://kb.mozillazine.org/Kill_application

When I try to open Firefox I get a message saying it is already open. However it is not open and i cannot access Firefox

When I try to open Firefox I get a message saying it is already open. However it is not open and i cannot access Firefox

See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding
If it happens after you've closed Firefox and want to restart the see these:
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

When I click on Firefox I get a message saying Firefox is already running, that I need to close Firefox or restart my computer and it still will not start, Why?

Firefox was working great until at least 3 persons were on my computer over the weekend. Now, when I want to open Firefox to go to the internet I get a message telling me that it is already running, that I need to close it down and if that doesn't work I should restart my computer. I have done all this, turned the computer off and back on many times, but I still get the same message. I do not know what the other people may have done when they were using my computer.

See these posts about the same problem:
*[/questions/798251]
*[/questions/823473]

How do I stop Firefox from creating untitled web pages when I try to send email from a web page. The only way I have found is to turn the computor off and then reboot. I don't have this problem when using Internet Explorer

Every time I click on a web site that has an email option the browser starts making untitled web pages and never stops unless I turn the computer off. It is very frustrating to not be able to use an email option when offered by a web site. The only way I can send email messages on the Firefox browser is to go into my hotmail acct. and copy and paste the addresses. I don't have this problem when I use the Internet Explorer browser.

See [[Firefox keeps opening many tabs or windows]]

I try to open Firefox. Get error message saying Firefox is already running and needs to close - another error message say Firefox can't open

Turned on laptop (rebooted) after being away from it for a few hours. Went to open my home page. Error message popped up saying Firefox is already running and must be closed. I closed it and another error message popped up saying Firefox can't open - incomplete or missing files.
I went into Processes to close Firefox. Selected 'end process' but nothing happened.
Tried to use Internet Explorer but it just gets hung up. Cannot access anything.
And, because I can't open Firefox, I can't go a refresh.
Everything was working just fine a few hours ago.
Any thoughts?

What is the computer system and Firefox on the bad computer?
Separate Issue;
Your System Details on this computer shows;
Multiple versions of your Adobe programs.
Having more than one version of a program may cause issues.
Go to '''adobe.com''' and download the full installers after removing
all of the old programs.
Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there?
This is not a cure but will make it easier if Firefox locks up in Windows.
'''https://support.mozilla.org/questions/997866''' {web link}

Every time I try to install the latest version of Firefox I get a message saying to close all programs using it. I have removed it from my computer I think.

I Want to use Firefox, but if I can't get it to install it's no good to me.

Hi,
Please check if '''firefox.exe''' is present in the '''Processes''' tab of the '''Task Manager''' ('''Ctrl''' + '''Shift''' + '''Esc'''), right-click on it and '''End Process'''. If it is not present, you may have to delete the '''parent.lock''' file in the [http://kb.mozillazine.org/Profile_folder Firefox Profile Folder]. Type '''%appdata%''' in the Windows Start menu '''Run''' box and open the '''Mozilla''' folder.
You can also try to uninstall the previous version via Windows Control Panel > '''Add/Remove Programs''' and do a fresh install. Please do take a [https://support.mozilla.org/en-US/kb/Backing%20up%20your%20information?s=backup&r=1&e=sph&as=s backup] of the important data.
[http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Files]

Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't help.

<blockquote>Locking duplicate thread. 
Please continue here: [[/questions/880054]]</blockquote>
Question
Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't he

Duplicate Thread LOCK please
* Continue here - https://support.mozilla.com/en-US/questions/880054

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Firefox crashes then when I try to reopen it I get a message saying it is already open and must be closed. It is not open and I cannot close it and have to reboot. It is very annoying as it happens often.

Firefox will close unexpectedly then when I try to open it I get a message saying it is already open and I must close it first. I cannot find it open anywhere and then I must reboot to open Firefox again.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]
See also:
* http://kb.mozillazine.org/Firefox_crashes

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Some times when I load Firefox, I get a message saying Firefox is already running. The only solution I have found is to reboot the system.

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