After closing Firefox and trying to open a new session, I get periodic pop ups telling the program is still running. I open the task manager and close it, and everything's fine. What's the issue, and how do I get it to stop?

Problem doesn't happen every time, and I've tried to leave it alone to see if there's an update that needs to finish loading. After being left overnight, I still had to use the task manager to close the Firefox program. I have no idea what it's doing, and I'd like to know. Is Firefox taking over my computer so it can move on to my house, and then go on to rule the Tri State Area?

See - [https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_firefox-hangs-when-you-quit-it Firefox hangs when you close it]

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I keep getting this message after closing Firefox and attempt to reopen-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.

I keep getting this message after closing Firefox and attempt to reopen-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.

See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use

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.

After closeing firefox and trying to reopen I get a mesage that firefox is still running and needs to be closed

Each time I close out firefox and try to open it again I get a message the it is still running and needs to be closed. I have to log out to get it to restart

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

After closing firefox and then reopening it, a message states that firefox is already running (in the background) and to restart computer.

the window closes normally, then when i reopen it i receive a message that states Firefox is still running. i open task manager and it is not shown on the application tab but is shown in the process tab, where i "end process" i would appreciate any help. thank you

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

After closing firefox, if i re-open quite quickly i am told firefox is running, when, to me, it is obviously not.

on some occasions, i will close firefox by the top right corner 'close' other than minimise it, whilst i open another application, eg e-mail.
if i then open firefox in the usual way within a little while of closing it, i receive a message that a version of firefox is running, and that i should close it (?) and continue, or if not, then restart the system. if i do nothing for a while, the problem disappears in the sense that i can open firefox as normal.
i have another situation that occurs when i use ' clear recent history'. i sometimes receive a message to the effect that some script is still running, and it is therefore preventing the deletion
of history. the comment that shows is 'SCRIPT:chrome://browser/content/sanitize.js:133'.
this could indicate that there is something always running in the background, even though i have closed firefox, which may be causing both problems.

*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

After installing Firefox 4 trying to open results in message "you cannot use Firefox 4 with this version of Mac OS X". What version of Mac OS X is required to support Firefox 4?

I would like to have Firefox 4 and do not know what else to say.

Firefox 4 requires at least OS X 10.5 and an Intel Mac.
Firefox 3.6.16 is the latest version for OS X 10.4

After closing firefox, try to re-open browser, error message ''firefox is running, you must either close firefox or restart computer'', but my browser is NOT open!?!

The only way to be able to open my browser again is to restart my computer.

*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

When Firefox freezes and reboot is needed, Firefox always tries to open the same tabs that caused failure before.

I use tabbed browsing all the time. When I open a tab to a website that causes a problem, freezing Firefox (but not the computer) I usually find that I can clear the Firefox problem only by rebooting the computer. I am then dismayed to find that Firefox then tries to recreate the same set of tabs that caused the problem in the first place, causing Firefox to freeze a second time. Usually I can get out of this by closing Firefox and waiting a very long time for Firefox to fully close so that it can be restarted again.
This problem happens in version 4.0 as well as in the last version of 3 that I had. I recall that in some earlier versions Firefox would ask if you want to recreate your tabs or open as a new browser window. I always took second option. That choice is no longer appearing.

Set the pref [http://kb.mozillazine.org/browser.sessionstore.max_resumed_crashes browser.sessionstore.max_resumed_crashes] to 0 on the about:config page to get the about:sessionrestore page immediately with the first restart after a crash has occurred or the Task Manager was used to close Firefox.
That will allow you to deselect the tab(s) that you do not want to reopen, but will allow to reopen other tabs. 
See:
* http://kb.mozillazine.org/Session_Restore#Restoring_a_session_after_a_crash
* http://kb.mozillazine.org/Browser.sessionstore.max_resumed_crashes
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page. 
You can use the Filter bar at to top of the about:config page to locate a pref more easily.

After closing Firefox to use IE8 or any other program, everything is very choppy and slow. I have to go into Taskbar, Processes, and close firefox.exe manually (which is using up all the memory/CPU). Then, and only then, does everything behave normally. W

After closing Firefox to use IE8 or any other program (like InterVideo to watch a DVD), everything is very choppy and slow. I have to go into Taskbar, Processes, and close firefox.exe manually (which is using up all the memory/CPU and should have closed before). Then, and only then, does everything behave normally. What is going on and what am I doing wrong or missing??
== This happened ==
Every time Firefox opened
== about a couple months ago and happens every time I close Firefox.

'''Kill Application'''
In Task Manager, does firefox.exe show in the '''Processes''' tab?
See: '''[http://kb.mozillazine.org/Kill_application Kill Application]'''
'''Causes and solutions for Firefox hanging at exit:'''
'''[[Firefox hangs]]'''
'''[http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit (Mozillazine article)]'''
'''[[Firefox is already running but is not responding]]'''
'''Safe Mode'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox SafeMode is a diagnostic mode that disables extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes before starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
See:
'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
If the problem does not occur in Safe-mode then disable all of your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You have to close and restart Firefox after each change via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.
'''''Other Issues''''': to correct security/stability issues
'''Update Java''': your ver. 1.6.0.19; current ver. 1.6.0.20 (important security update 04-15-2010)
''(Windows users: Do the manual update; very easy.)''
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
Do the update with Firefox closed.

After restoring Windows I tries to open iTunes and got a message saying 'This version of iTunes has not been correctly localized for this language. Please run the English version.' how do I do this?

After restoring Windows I tried to open iTunes and got a message saying 'This version of iTunes has not been correctly localized for this language. Please run the English version.
What do I do? I don't want to lose my entire liberary!

Hi there computerfailure,
You may want to try removing and reinstalling iTunes as an initial troubleshooting step. Take a look at the article below for more information.
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
http://support.apple.com/kb/ht1923
-Griff W.

Hardware acceleration in Firefox 4 fluctuates my gpu clock speed and for some period of browsing will hang the gpu at the highest clock speed available even after closing Firefox 4.

After browsing heavily in Firefox 4 for some time, my gpu (ATI 5870 with the latest drivers) will stay clocked at the highest clock speed of 850Mhz and memory clock speed of 1200Mhz. Even after closing Firefox 4, the gpu will not down-clock and stay at those highest speed. I've tested the same browsing pattern on IE9 and in which this problem didn't exist so I don't think it's a driver issue. I now have to browse with hardware acceleration turned off to ensure I don't get this problem.

Ive downgraded from FF4 to 3.6 at this point. The CPU usage is out of control on OS X.

Before, when i closed Firefox with multiple tabs open, it prompted me and asked if I wanted to return to these tabs the next time. When i downloaded the new Firefox, i can't do that anymore. Is there an add-on to make that happen?

I recently updated Firefox on my desktop and laptop. Before, when i closed Firefox, a window would open and ask me if i wanted to return to the same group of URL location tabs the next time i opened Firefox.
Now it doesn't ask that, so i have to remember which sites i was using each time. Is there a way to return to the same group of URL locations each time I re-open Firefox?

For a summary of what to do to get the old behaviour back see this post from [https://support.mozilla.com/en-US/questions/804339#answer-158823 Helper 7677]

After deleting firefox and reinstalling it Ikeep getting a message telling me that it cant be updated until i deleate the original programme how do I get rid of that message

after deleting firefox and reinstalling it Ikeep getting a message telling me that it cant be updated until i deleate the original programme how do I get rid of that message

You seem to be running the latest Firefox 9.0.1 version according to the user agent in your system details list:
*Mozilla/5.0 (Windows NT 5.1; rv:9.0.1) Gecko/20100101 Firefox/9.0.1
Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 9.0.x: http://www.mozilla.com/en-US/firefox/all.html
Uninstall your current Firefox version, if possible.
*Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*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 profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

How do I stop Firefox from thinking it crashed and doing a recovery when forced to use Windows Task manager to close a bad URL that I never want to go back to?

Long question, I know :~) There are web sites that I may visit that will not allow me to exit the site, so I use Alt-Ctrl-Del in Windows to start the Task Manager and force the site to close by ending the program. The new version of Firefox (31.0) thinks that Firefox crashed and send me right back to the source of my problem.
Your documentation for this process is as follows:
After a crash
Due to unexpected issues such as problems with a website, software errors, or an accidental loss of power, Firefox may unexpectedly close. In these situations, Firefox can restore the pages that you were visiting when it is restarted. Firefox will automatically restore your previous session, the first time you launch it after a crash.
If Firefox crashes a second time, the Restore Session (i.e. "Well, this is embarrassing") page will appear when you next launch Firefox.
...and this is what I found trying to stop this process. Next, when I am forced to use Task Manager to close Firefox a second time to stop a badware site, then the 'Well this is embarrassing' dialog appears and I am finally safely away from the URL.
I do not want Firefox automatically sending me back to a problem site.
Thank you for any procedure you can suggest to stop Firefox from restoring problem web pages, Art Clapton

I am unwilling to attempt navigation away from these sites. The pop-ups that occur on the attempt to leave a site or to close the browser are exit traps offering incentive to stay.
Once upon a time, when the internet was less dangerous, I would be willing to close the exit pop-ups. Now, after twice being infected with malware trying to close the pop-ups, I now force close whichever browser I am using.
Recently, I clicked on the red X to close one pop-up, and it installed a trojan that I had to pay to be removed. When I clicked on 'Leave' in another exit pop, it didn't exit and it turned out I was giving permission to run a script file. Now that criminals have learned these exit pop-ups can be used to force a click action, the sites using them have become dangerous.
If I force the browser to close using Task manager, Please tell me how to stop FireFox from sending me directly back to the same site because it mistakenly believes it crashed when it did not. I forced it to close because I was on a site that had taken control of my browser and was not allowing me to leave the site.
No other browser sends me back to the potentially dangerous sites. I prefer Firefox, but the new version must have a setting that allows me to get safely away from a problem site?

After closing Firefox and trying to open a new session, I get periodic pop ups telling the program is still running. I open the task manager and close it, and everything's fine. What's the issue, and how do I get it to stop?

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