Err MSG Firefox already running even after uninstall & restart, incl x64 version on Win 7x54. Nothing running in Task Manager.

Error message on Win7 x64 system, new install. First installed FF4 but error message on starting "Firefox is already running but not responding etc (Restart) Same result after restart. Uninstalled, installed 3.0.1 same result. Uninstalled, found and installed 3.6.6 64 bit. Same result. Total inability to open at all. I have 32bit 3.6.6 on this machine - also Win 7 x64 & quite OK.

You will need to get to the bottom of this problem and try to prevent it happening in the future
# First of all create and use a new additional Firefox profile. I am hoping that will result in at least a Firefox that you can close-down. [[Use the Profile Manager to create and remove Firefox profiles#w_creating-a-profile]]_creating-a-profile
# Note that normally the method of closing down Firefox is to use the Firefox menus | Firefox-button. (Using other methods may create problems, & there are some current / recent bugs Bug 845681 & 8537799 )
#* By default on XP ''File -> Quit'' , (Other systems use the Firefox button options)
#What you are experiencing appears to be a Firefox hang, although they may often be terminated by killing the Firefox process. [[Firefox hangs or is not responding - How to fix]]
#Sometimes after multiple problems Firefox will have multiple copies of the restore files, and although you could loose some information | tabs deleting these non functional copies may be required to resolve the matter
#* see http://kb.mozillazine.org/Firefox_hangs#Multiple_sessionstore.js_files and http://kb.mozillazine.org/Sessionstore.js Note numbered additional copies may exist.

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Am told firefox is already running , but task manager doesn't show it

am told firefox is already running , but task manager doesn't show it. I installed Firefox 3.6.10 on a new computer (win 7 home premium), deleted the profile given and copied my old profile in its place (win vista premium). I get the above message and am told to close the existing process, or restart the system. Can't close and restarting doesn't help. Please solve this for me, i so don't want to use Internet Explorer

g'day people... a dude called "moopenguin32" showed me the way... alleluia
1. Copy your Firefox shortcut (what you click on to open Firefox) to the Desktop.
2. Right-click on it and click on Properties.
3. Go to the end of the text in the "Target" field. The end will say: firefox.exe"
4. Enter a space followed by: -profilemanager
5. The end result will look something like this: "C:\Program Files\Mozilla Firefox\firefox.exe" -profilemanager
6. Click OK to save the settings.
7. Double-click on the shortcut you just changed.
8. Delete the profile listed. It shouldn't matter that you're deleting it because you're trying to restore a profile anyways. You should have the profile you're trying to restore saved elsewhere.
9. Close the profile manager.
10. Start Firefox using your regular shortcut. Firefox should open properly. Close Firefox.
11. Now to restore your profile, open the profile folder you have backed up and copy the contents of it rather than the actual folder.
12. Go to your existing Firefox profile and open it.
13. Delete the contents of the existing Firefox profile.
14. Paste the contents of the Firefox profile that you're trying to restore (the one you copied in step 11).
15. Open Firefox and everything should be there (including your extensions).

A window asked me to close firefox.exe so it could do something (AVG I think). Now, I can't open Firefox at all even after uninstalling and reinstalling.

When I took my laptop, which is running in XP, to get rid of a
number of trojans, etc, the computer tech put AVG on it. Since
then, I have been getting random notices from AVG. I got a
notice and clicked it before thoroughly reading it, assuming it
was another one of these. It said something about closing
Firefox, and I thought it needed to close Firefox so it could
scan something. Ever since, I click on the shortcut or the file
itself to no avail. Nothing happens. I've even tried
uninstalling and reinstalling. Have I unknowingly changed my
administrative settings?

Annette,
#In the menu bar, at the top of the Firefox window, Go to Tools -> Add-ons -> Extensions.
# Locate ''each ''of the following extensions by name and click the disable button
#Restart Firefox as prompted and see if the undesired toolbar has been removed.
#The extensions to disable are: '''Crawler Toolbar''', '''MP3 Rocket Toolbar''', '''MSN Toolbar''', '''Search Helper Extension'''
If you don't need some / all of those toolbars, consider leaving them disabled.
You can probably remove these toolbars permanently from Start -> Control Panel -> Add/Remove Programs.

I use Firefox to access the internet-but when I go off the internet but don't shut down, then go back on Firefox it won't open because "it is already running". Task Manager doesn't show that it is operating so I can't shut it off. What to do?

It is in the question but to repeat.
1. When I go online I use Mozilla Firefox
2. While I am doing other work, I usually close the internet.
3. If I go back on the internet and click on Mozilla it won't come up, stating that "it is already running".
4. Despite that, when I open Task Manager, it doesn't show that it is running so I can't shut it down or open it.
5. If I log off or shut off the computer, then after I log in or reboot the computer, I can open Mozilla.
Thanks from a Mozilla fan.

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 LV 7, MAX 3, NIDAQ 7, can not target to LV 6.1 RT even after uninstalling and loading older version.

We have started using LV 7 for all of our new projects but still have to support a number of older projects made in LV 6.1. After installing LV 7, MAX 3 and NIDAQ 7, we can not do remote DAQ configuration on the older version of RT and can not target to the RT system either. We used NIs uninstall for MAX and NIDAQ and then reinstalled the older versions, but we still can not remote DAQ configuration. Computers that have the older versions of MAX and NIDAQ and have never had the newer versions installed have no problem with remote DAQ configuration or targeting.
How can we go back to the previous version of MAX and NIDAQ and get it to work? What is left
after uninstalling the newer versions?

Rob,
I would recommend creating a Service Request on-line and contacting an Application Engineer. There are several possible reasons that software might not be completely removed, and we have some utilities that will make sure this does not happen. There also might be some issues with downloading the code to the "target". We could quickly reformat the controller and make sure to get the older software on the system.
Regards,
Robert Jackson
Application Engineer
National Instruments

Firefox icon in the Taskbar will not start on the first click, sometimes needing to click 2 or 3 times for it to open (and this is after a fresh reboot with Firefox not running in Task Manager.

Upon a fresh reboot the Firefox icon in the Taskbar will not work on the first click, sometimes it will not work at all and I need to go to Start-> then click the Firefox icon in the Start menu. Why is it that the icon won't start up on the first click?

Same issue - however firefox will open but I can not click on only of my tool bar shortcuts - the writing on the google age is greyed out so I can not click on anything. Still no resolution? I have deleted the folders and re-installed - it will open and then locks and it will not work????

Firefox is running in task manager, but browser does not open.

this happened after most recent update v 27. gateway running win8, worked everyday before this update, does not work now.

Sounds good.
Since you know how to move bookmarks, you probably could move other relevant data if you wish (details on what is in the different file: [[Recovering important data from an old profile]]).
If you discover problems with the new profile after shutting down and restarting Windows, there could be some external process running that is causing this problem (whether injecting an add-on or modifying a file).

After reboot firefox won't start. runs in task manager, but won't pop up. reset, safe mode and uninstall/re-install won't help. ok if no reboot.

win7 Pro. has been running firefox ok. but lately with 25 and now 26, the firefox won't start. I can see firefox is running in task manager. but it just won't pop up.
if I download it again and install it, it will run, but every time I reboot the system, it just won't run again.
try: reset, safe mode, uninstall & reinstall, new/clean profile, none of those work.

There may be a corrupted file on Firefox. 
Please attempt to perform a clean reinstall. [https://support.mozilla.org/en-US/kb/forum-response-clean-reinstall (More Details)] This is different than a regular uninstall.
If a clean reinstall does not fix the issue, please try starting your operating system in safe mode. 
To do so, please do the following:
#Ensure that your computer is shut down completely
#Press the power button
#Tap the <code>F8</code> key repeatedly before the Windows logo and startup screen is displayed
#Select Safe Mode With Networking for the advanced startup options list
Please report back with the results of both solutions.

Even after uninstalling, reinstalling Firefox, the Firefox profile folder is empty, and I get the message "Firefox is still running and not responding close firefox...

Even after uninstalling, reinstalling Firefox, the Firefox profile folder is empty, and I get the 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." I have followed all the directions I can find, on my computer and Firefox Support. Still, the same message comes up, and "firefox" is not shown in my Windows Task Manager.
What can I do?

Delete the profiles.ini file and let Firefox create a new default profile.
* http://kb.mozillazine.org/profiles.ini_file
* http://kb.mozillazine.org/Profile_folder_-_Firefox#Files_and_folders_outside_the_profile_folder

Firefox will not connect to internet after upgrade. The window pops up but shows "connecting " in tab. And then it sit there. Close it down and then try to reopen it and get message " Firefox already running, Exit program or shut down computer" ???

Firefox will not connect to internet after upgrade. The window pops up but shows "connecting " in tab. And then it sit there. Close it down and then try to reopen it and get message " Firefox already running, Exit program or shut down computer" ?????????????????

1st problem see http://kb.mozillazine.org/Firewalls
2nd problem, to close Firefox properly use File > Exit
:not with the [x] in upper right corner which close window
:see http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit
:if restarting use "Restartless Restart" extension as mentioned there.
 Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.

"firefox already running"problem,uninstalled-reinstalled firefox still no luck,anyone? Thank You

Firefox was not in the processes in the windows task manager but "already running" would always pop up. Uninstalled reinstalled and "firefox already running"came up again.

Do you still have the default profile?
See:
http://kb.mozillazine.org/Recovering_a_missing_profile
http://kb.mozillazine.org/Profile_in_use

After stopping FF when I restart it , I get a pop up displaying Firefox already running but not responding. Please Help?

After stopping FF when I restart it , I get a pop up displaying Firefox already running but not responding. Please Help?

There are several possible causes, see [[Firefox is already running but is not responding]].

Firefox already running, profile missing or inaccessible, cannot kill in task manager

For reference, this is on windows 8
In the past I've (very rarely) had the "firefox is already running" error and was able to fix it by ending the process in task manager. I updated to firefox 36 the other day. Since then, firefox will run perfectly normally for a while, but after some time (varies from minutes to hours) I can no longer load new pages. The loading wheel just keeps spinning.
Once this has happened, if I quit firefox and try to open it again, it will give me "firefox already running" followed by "profile missing or inaccessible" error messages. If I go to task manager, sometimes no firefox.exe is there, sometimes it is and I cannot close it. In either case I still can't start the program.
I tried reinstalling firefox, which did not fix the issue. I've also tried creating a new profile, again to no avail. AVG picks up no malware. I did a system restore to a week ago, which seemed to work for a while, but the problem has started again. I'm looking for a solution other than installing an old version, if possible.

Do you have the Firefox icon on your quick launch? Right click
on it, and select '''Open New Window.''' Sometimes this works.
If it opens, close it by '''Menu > File > Exit.'''
This is not a cure but will make it easier if Firefox locks up in Windows.
'''https://support.mozilla.org/questions/997866''' {web link}
Separate Issue;
Your System Details shows;
Installed Plug-ins
Shockwave Flash 16.0 r0
Shockwave Flash 11.8 r800
Having more than one version of a program may cause issues.
Grab the uninstaller from here:
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]'''
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]'''
Then reinstall the latest version.
Flash Player '''Version 16.0.0.305 https://www.adobe.com/products/flashplayer/distribution3.html'''
Shockwave Director '''Version 12.1.7.157 http://get.adobe.com/shockwave/'''

I am unable to install extensions, they show up with "will be installed after you restart Firefox" even after I restart.

Hi,
I am unable to install extensions, they show up with "will be installed after you restart Firefox" even after I restart.
The "Staged" folder is present and remains after a restart, but the extensions do not get installed. They show in the extensions page with the "will be installed after you restart Firefox" message and remain like this no matter how many times I restart.
Any Idea's?
Running Firefox 24.0 on Windows 8.1
Many Thanks,
BD
P.S. Just tried to install the "troubleshooter" add-on before posting the question and I got an error saying it cannot install because it cannot modify the needed file. (I did it manually instead)

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file.

Firefox will not start on limited account. Reports firefox already running but doesn't show in task manager. Adminstrator account work fine

Firefox will not start on limited accounts. It reports firefox already running. This happens even if no other users are logged on. Administrator accounts have no problems accessing firefox

Create a new profile as a test to check if your current profile is causing the problems.
See Basic Troubleshooting: Make a new profile:
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Err MSG Firefox already running even after uninstall & restart, incl x64 version on Win 7x54. Nothing running in Task Manager.

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