When I close firefox I cannot launch again without restarting PC. I deinstalled and reinstalled without succes

Only since a few weeks, when I close Firefox and after a wile want to use it again I get the notice that there is still a version running. I do not find this version and so I cannot close it. The notice advises to restart the computer. then the Firefox starts again. I uninstalled Firefox en reinstalled but without any change.

Hello fredakis, go for a '''clean re-install''', This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from https://www.mozilla.org/firefox/all/ (full installer) and save the setup file to your computer.
#After the download finishes, close all Firefox windows (or open the Firefox menu [[Image:New Fx Menu]] and click the close button [[Image:Close 29]]).
#Delete the Firefox installation folder, which is located in one of these locations, by default in '''Windows:'''
* C:\Program Files\Mozilla Firefox
*C:\Program Files (x86)\Mozilla Firefox
Now, go ahead and reinstall Firefox:
#Double-click the downloaded installation file and go through the steps of the installation wizard.
#Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

Similar Messages

When I close firefox it warns me that I am closing multiple tabs. and will not let me save them. the only option is cancel or OK.

This just started. When I close firefox it warns me that I am closing multiple tabs. and will not let me save them. the only option is cancel or OK. When I say OK and restart Firefox all my tabs are going:-( This happens every time now. I know how to get my old tabs back but every time I close Firefox it always warns me that I am closing multiple tabs.
Tanks for helping me get me Firefox working correctly again
Jim

Do not use "Clear history when Firefox closes" to clear the "Browsing History".
*Tools > Options > Privacy: History: [X] Clear history when Firefox closes > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
Using the "Show my windows and tabs from last time" setting is a more reliable way to restore session data.
* Tools > Options > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"

When I close Firefox then wont reopen unless I go to task Manager and close program from there.

When I close Firefox it will not open another window when you click on icons or manually try to open new window. I have to open Task Manager find Firefox program and manually close program. Then when you open a new Firefox window it try's to restore previous session , saying sorry Firefox crashed. I have uninstalled and reinstalled , turned off all add-on's nothing has worked. No virus's , no other outside influences , nothing else on my computer has issues. Can you help?

See this: 
https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit

When I close Firefox I cannot reopen it without restarting my computer.

If I try to re-open Firefox I get the message already open close or restart your computer.

Try to Wait a bit longer before reopening Firefox to give Firefox more time to close completely.
Use "Firefox/File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") to close Firefox if you are currently doing that by clicking the close X on the title bar.
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

I can uninstall firefox then reinstall it then it opens when i close firefox i get crash report then i have to uninstall then reinstall to get it to work.

I have tried everything. i have installed uninstalled it works the first time then when i close all windows and try to reopen i get a crash report. then i cant even open in safe mode. so i go through the uninstall and reinstall process again. this has been a nightmare. I hate chrome but may have no choice but to change browswers. I have had this problem before but dont remmeber what i had to change in the about:config settings to resolve.

If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
You can find the Report ID of recent crash reports on the "Help > Troubleshooting Information" page (about:support).
*Click the "All Crash Reports" button on this page to open the about:crashes page and see all crash reports.
If necessary then you can open about: pages via the location/address bar.
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
*Download the full Firefox installer and save the file to the desktop https://www.mozilla.org/en-US/firefox/all.html
If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
*Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: http://windows.microsoft.com/en-us/windows/using-defender
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
*https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

Copy/paste in a Word document loses its format (bullet points, coloured tex, etc) when Firefox is open. When I close Firefox it is fine again. I am not talking about copying and pasting text between MS Word and Firefox. It is within MS Word itself.

Firefox 11.0
MS Word 2003 Basic Edition SP3

Disabling the the Skype Click to Call extension fixed the problem.
Many thanks !!!!!!

Why does Firefox try to launch Adobe and/or Quicktime when I close Firefox? What is it loading into those programs?

When I shut down Firefox, it tries to start Either Adobe Reader, Quicktime, or both. It has done this ever since the first time I installed an used version 4. The applications do not actually launch, as in a window opening, but they are then present as a process in the system, and I have to close them from the Task Manager. It usually launches just one, but, if it's trying to launch one, and I use Task Manager to close it, it then launches the other. If I hurry and stop that one, Firefox reports that it messed up, and wants me to keep using the Internet for its own purposes that have nothing to do with what I was using the Internet for. This never happened under previous versions of Firefox. Do I need to revert to a previous version? I'm running Kaspersky Internet Security, and it shows I have no malware or the like on my computer, which could cause this. So, why is Firefox trying to do things I did not ask it to, and then expecting me to let it phone home to tell about it when I stop it. By the way, out of good practice, I often close down my Internet connection before closing Firefox, (in case I do get something like a Key Logger loaded, to prevent it from sending its final report before the cache is cleared), but this also happens when I have not yet closed my Internet connection before closing Firefox, so I do not think that is the issue, nor should it be. Your question below about when it happens does not provide for the answer "Every time Firefox Closes", so I picked the closest such answer.

This can be caused by clearing the cookies via [[Clear Recent History]]. 
* Firefox/Tools > Options > Privacy > Firefox will: "Use custom settings for history" > [X] Clear history when Firefox closes > Settings
You can try to exclude the cookies to test that. 
You can let all cookies expire when you close Firefox to remove unwanted cookies and keep the ones with an allow exception.
* Tools > Options > Privacy > Cookies: "Keep until": "I close Firefox"
If you use [[Clear Recent History]] to clear the cookies when you close Firefox then Firefox also tries to clear the cookies from plugins like Flash and starts a plugin-container process for each plugin and possibly for each cookie (?) and that can add extra time if there are a lot of cookies to remove and also can cause an unresponsive script error to appear.

When I close Firefox and then come back to it layer a box comes up that says it's already running. It ays to close Firefox first but when I hit close nothing happens and the box comes up again. I have to shut down my computer and restart to get into Firef

When I close Firefox and then come back to it later a box comes up that says it's already running. It says to close Firefox first but when I hit close nothing happens and the box comes up again. I have to shut down my computer and restart to get into Firefox again. If I can't get this fixed I will start using someone else. Someone told me a way to close Firefox but I forgot what they said.
== This happened ==
Every time Firefox opened
== a couple of months ago

Hello Brian.
You don't need to restart your computer to open Firefox again: you just need to close it manually through your application manager (CTRL+SHIFT+ESC in Processes tab). Anyway, hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+hangs
What's probably happening is that you may be having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
If you want support for one of your add-ons, you'll need to contact its author.

When I close firefox "everything " is cleared! EXCEPT when I open it again and anything i have copied to the clipboard (paste icon) remains lit... I believe this can be a security breach because I clear everything when closing firefox !!

I have my settings to clear everything when I close firefox ver 3.6.13. If I copy something to the clipboard, the Paste icon lights up so I can paste the text... which is normal.
The problem is when I close the browser and everything is suppose to clear (history, etc) the PASTE Icon still lights up for me to paste again.
This can be a security breach because I want everything cleared when closing the browser !!!
The only way I can rid myself of this problem is to restart the computer... which clears the clipboard of the operatinging... which is absolutely normal as well.
I should not have to restart the computer each time.
Try It !!! type text in any box... then paste it by using the PASTE Icon
CLEAR all your history, everything ... then close firefox
Reopen the browser... and the PASTE Icon will light up

I only had a few addons installed, I disabled Zone Alarm toolbar, View Source Chart 3.01. I also had 5 separate java console updates/addons, and I uninstalled all but the latest java console 6.0.21. All I have now is Roboform 6.9.98, Firebug 1.5.4, Java console 6.0.21, Java quick starter 1.0. So far, so good, the problem has not occurred today. I hope this is it, I will be more sure after a few days problem free. Thanks for the info.

I copied this from your 5.0 download information: "All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again." When I opened my computer today all my apptabs from yesterday had disappeared. Why?

Your download page for 5.0 stated: All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again.
I liked the convenience of using App Tabs and was disappointed to find that the ones I had set up yesterday were gone today. Am I doing something wrong?

Works fine for me, I can simulate your problem by improperly closing Firefox.
The correct way would be to close the windows you don't want and then to exit Firefox through the File ("'''Alt+F'''") menu then use '''Exit''' or '''Qui'''t depending on your system.
But '''I can simulate your problem''' by closing the good window with "X" in the upper right-corner first (the one with the app-tabs) and then close the other window by any means.
You restart Firefox and open a window, since you closed without app-tabs there are none so you just see a window with your home page.
Firefox has some things added to Firefox 4 and therefore in Firefox 5.
# "'''Alt+S'''" (Hi'''s'''tory menu)
# "'''Restore Previous Session'''" (that's the window without the app-tabs, but you have to this first)
# "'''Restore Recently Closed Windows'''" -- can choose which window to reopen based on name and the mouse-over tells how many tabs. or you just use "'''Restore All Windows'''" without the guessing.
''I know you are on a Mac, and this affects Windows user more than anybody else, but it does affect other systems besides Windows, occasionally, perhaps more often now with the plugins container.''
The following may not completely eliminate having to terminate Firefox through the Windows Control Panel but it will come very close.
'''Plug-in and tasks started by Firefox may continue after attempting
to close Firefox''' The "X" in the upper right-hand corner closes the
Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
it does not necessarily close Firefox .
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X
* '''Firefox hangs''' | Troubleshooting | Firefox Support http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see 
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
'''Avoiding Problems with close/restart''' ''choose either extension''
:Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
Both extensions use the same keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
*"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) https://addons.mozilla.org/firefox/addon/249342/
*For older versions use "'''QuickRestart'''" extension (34 KB download) ( https://addons.mozilla.org/firefox/addon/3559/

When I close Firefox, then later want to start up again, I get I message that Firefox is still running. With "START TASK MANAGER", I need to close Firefox in order to start again.

When I close Firefox, then later want to start up again, I get I message that Firefox is still running. With "START TASK MANAGER", I need to close Firefox in order to start again.

I have the same problem. Firefox won't unload regardless of how long I wait. Literally hours ... I must go in and 'end the process'. This has been a real hassle for a while now. Even considered giving up on firefox. Please look into this! An additional problem; I have to run firefox to get the updates, but I can't get the updates to take because I can't get firefox to unload so I can restart it.

When i close firefox it keeps running in the background and i have to got in taskmaster to close it so i can open it again

when i close Firefox it keeps running in the background and i have to got in taskmaster to close it so i can open it again I am running windows 7 64 bit

Firefox Hang at Exit
https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
See the Bulleted points in this section
Check and tell if its working.

With Firefox running, Office 2007 generates a "Cannot Empty Clipboard" error message when pasting information between Excel cells -- the behavior goes away when I close Firefox. Is there a way to prevent this?

I am running Windows XP, Office 2007, and Firefox 3.6.13.
Whenever I have Firefox running in the background and I attempt to paste information between Excel cells a "Cannot Empty Clipboard" error is generated. I have attempted numerous other fixes for this: Excel and Office settings. But nothing seems to help. When I close Firefox, the errors are no longer generated.

The Skype add-in was the culprit in my case. Disabling it fixed the problem. As soon as I enable it, the problem comes back.

When i close firefox and reopen it, the previus web site reopens again

when i close firefox the web page i was visiting, and i reopen a new session the previous page i was visiting reopens again, i cleared cache, history no hel and reinstalled it no help [lease help me ty .

Use one of these:
*Tools > Options > General > Startup: "When Firefox Starts": "Show my home page" "Show a blank page"

When I close Firefox, the windows closes normally, but firefox.exe still appears in Processes in Task Manager. I have to End Process to open Firefox again, and it goes to Restore Last Session page.

When I close Firefox, the windows closes normally, but firefox.exe still appears in Processes in Task Manager. I have to End Process to open Firefox again, and it goes to Restore Last Session page.
Quando eu fecho o Firefox, a janela fecha normalmente, mas o firefox.exe ainda aparece no Processos do Gerenciador de Tarefas. Eu tenho que Finalizar Tarefa pra abrir o Firefox de novo, e quando abre vai para a página de Restaurar Última Sessão.

I have the same problem - every time I close firefox (using either the red x or by selecting file ---> exit) the program appears to close normally, but the firefox.exe *32 process continues to run. If I try to re-open firefox normally I get a message that the program is still running and I need to go into task manager and manually kill the process.
I could also kill the process from the command prompt, but both of those methods are slow and annoying. This issue has only been occurring for the last 24 hours or so; to the best of my knowledge I haven't downloaded any new software or updated any plug-ins that would have caused a switch from firefox's normal awesomeness. Norton doesn't show any new viruses or other nastiness on my computer.
I'm running 64 bit Windows 7 Home Premium edition.

When I close firefox I cannot launch again without restarting PC. I deinstalled and reinstalled without succes

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