After a start-up I'm told "Firefox update cannot be completed, Please close existing Firefox. There is no other Firefox running after a fresh start-up.

If Firefox is sending me updates they won't come thru because I'm told that Firefox is already running. I get this message whether it is the first time I'm using it for the day or even after a start-up. This started about two days ago.

Hi,
Please try this: https://www.mozilla.org/en-US/firefox/new/

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When I start firefox is says other version of firefox is running and tells me to close it. I hit ok and firefox comes on. there is no other version running?????

when I start firefox is says other version of firefox is running and tells me to close it. I hit ok and firefox comes on. there is no other version running?????

See also [[Firefox is already running but is not responding]]

After updating itunes three (3) days ago - itunes close shortly after starting with the message "a problem occured and cannot be solved, please close application"

After updating itunes three (3) days ago - itunes close shortly after starting with the message "a problem occured and cannot be solved, please close application" - Platform: WIN7 - iTunes 11.2.9.115

Start with the third box in Troubleshooting issues with iTunes for Windows updates.
If that doesn't work, use the steps in the second box to repair your iTunes installation. Your library should be unaffected by these steps but there is backup advice elsewhere in the user tip.
tt2

HT4972 Hi! I have tried to update OS from 4.3.5 to latest on Ipod touch but every time after 70% completing an error is prompted and say update cannot be completed. Please check the setting. Please guide in this respect to be updated.

Hi!
I have tried to update OS from 4.3.5 to latest on Ipod touch but every time after 70% completing an error is prompted and say update cannot be completed. Please check the setting. Please guide in this respect to be updated.

Disable the computer's firewall and antivirus during the download and update.

ERROR MASSAGE-"The update could not be installed.Plase make sure there are no other copies of firefox running on your computer,and then restart firefox to try again".

<blockquote>Locking duplicate thread.<br>
Please continue here: [[/questions/870411]]</blockquote>
"The update could not be installed.Please make sure there are no other copies of Firefox running on your computer,and then restart Firefox to try again"this kind of error massage i found but there are no other copies of Firefox running on my computer.So please solve my prob.I can not uninstall this because i have saved important bookmark on my system.When i start my Firefox that time browser is opening few times later may be it's my internet slow connection but everyone has slow connection internet they are not having this prob then why should i have this prob.Why it is taking little bit time to open?

Thanks for the info about Trojan. It may be the problem. Meanwhile I went to Admin/Owner side and did some cleaning -- including trying to reload my Favorite/Bookmarks that have always carried forth from previous levels of Windows XP and earlier.
The new computer here did not grab the Bookmarks from the previous, and yesterday I thought I had them loaded, and today went to Worker-Bee side and they are not showing.
About those add-ons... I have no idea, but think I got everything up to date yesterday. I will look at your earlier reply tomorrow or this weekend when I have more time at home to learn from it.
Thank you for your time in helping.
Late here, heading to sleep. Marilyn

Firefox will not start up, there is no other instance running, and profile manager will not start either.

I try to start Firefox, but it just doesn't start. I have tried every way of starting it I can think of. Nothing that appears Firefox related shows up in the task manager process tab. I don't remember having any kind of crash. There is no error message. (If I click on a URL in an email or something, I get a "general failure" message -- I assume that's because my system is supposed to open FF and can't.)
I rebooted, and tried uninstalling and reinstalling. One of the help thingies suggested using profile manager to change my profile, but it looks like profile manager is part of Firefox, and it won't run.

Make sure that Firefox is completely closed, when you try to run the profile manager.
Can you try to get your crash report ID (without opening Firefox) using the instructions at https://support.mozilla.com/en-US/kb/Firefox+crashes+when+you+open+it#Getting_your_crash_report

When trying to click on firefox I get a message, firefox is already running, and asks me to close it. I have no other programs running. I cant even get firefox thru google chrome or internet explorer.

I recently upgraded to firefox 3.6, I think the inability to access firefox began after that. I`m worried that I may have lost my bookmarks.
== This happened ==
Every time Firefox opened
== For the past week, when I attempt to click on firefox ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4

This has been happening to me for months IN w &. It is REALLY ANNOYING.
MY WAy AROUND IT IS TO PRESS Ctrl,Alt,Del & select or start the
Windows Taskmaster.
Select Processes Tab & scroll down until you find "firefox.exe" , select it & at the bottom select End Process. In the next window press on End Process & Firefox will be closeD. Get out of that & you will be able to start Firefox.
A bit messy but saves re-starting the computer.
I WISH THEY WOULD FIND A SOLUTION!!!!!!!!!!!!!!!!!!!

Cannot install update, other firefox is runnibg, close first. but there is not any program running

Firefoc probeert een update te installeren.
Venster verschijnt: kan de update niet installeren omdat een ander firefox in gebruik is. Sluit firefox.
Er is echter geen ander firefox in gebruik.
Als ik het schermpje weg tik, komt het steeds terug.
Wat kan ik doen om Firefox weer te starten zonder dergelijke vervelende meldingen?
Waarom wordt niet eerst gevraagd of je de update wilt installeren en hoe dat moet?

Hi 1611kjb,
Please refer to the solution mentioned in the following threads :
http://forums.adobe.com/message/5396792#5396792
http://forums.adobe.com/message/5409050#5409050

With the latest update I get the following error: The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again; suggestions, advice, help.

Help>About Firefox> says I am using Firefox/3.6.10./GTB7.1 I get a note from Mozilla that there is an update. I download it after granting permission to change my machine. I say OK. A green bar slides across the monitor announcing that the update is being downloaded. When I then assume it is being installed I get the following error: The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again. There are no other copies running. The machine is not on a network. I am using WIN7

Thanks for the info about Trojan. It may be the problem. Meanwhile I went to Admin/Owner side and did some cleaning -- including trying to reload my Favorite/Bookmarks that have always carried forth from previous levels of Windows XP and earlier.
The new computer here did not grab the Bookmarks from the previous, and yesterday I thought I had them loaded, and today went to Worker-Bee side and they are not showing.
About those add-ons... I have no idea, but think I got everything up to date yesterday. I will look at your earlier reply tomorrow or this weekend when I have more time at home to learn from it.
Thank you for your time in helping.
Late here, heading to sleep. Marilyn

After FF is closed sometime I go to start FF I get a popup saying Ff is already running please close to open new window.

After closing FF latest version 7.0.1 I try to start ff again I get a popup window saying FF is already running please close FF to start a new window.
To get FF to run I have to log off then log on to windows and then everything is fine.
This does not occur all the time it is an intermittent problem, but is a PITA when it happens

May be your Firefox is running in the background. Ctrl+alt+del will bring up the task manager. See if FF is still running in applications or processes. If yes, kill it.

When I start mozilla firefox web browser, sometimes I see a message saying that "a Mozilla Firefox is already running, please close it or restart your program", while I don't have one running at that time. What is the problem?

When I start mozilla firefox web browser, sometimes I see a message saying that "a Mozilla Firefox is already running, please close it or restart your system". As a matter of fact, there is no firefox browser running at that time. Since I cannot do anything about it, I have to restart my computer before I can use the web browser, which bothers me dearly. What is the problem?

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.
''Menus hidden: then use Alt+F then X.''
'''Firefox hangs''' | Troubleshooting | Firefox Support ''(some extensions cause a problem)''
* http://support.mozilla.com/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.
"'''Restartless Restart'''" extension for Firefox 4.0 only (2 KB download )
* https://addons.mozilla.org/firefox/addon/249342/
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.
Uses keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
'''Windows 7''' users can use '''Ctrl+Shift+Esc''' to get to the Windows Task Manager quicker than starting with Ctrl+Alt+Del.

Hello, I've recently upgraded to 6.0.2 and find when I have closed my firefox browser it wont open again. I am told firefox is still open and it needs to be closed or I have to restart my pc again. I am operating Windows XP

I am told Firefox needs to be closed before I can access it again. Firefox is already closed so I have to restart my desktop. This problem didn't arise with the previous version of Firfox.

Firefox will not start
* https://support.mozilla.com/en-US/kb/Firefox%20will%20not%20start
* http://kb.mozillazine.org/Browser_will_not_start_up
Check and tell if its working.

After updating to Firefox 11.0 Mac, Firefox runs, but no window can be seen

I'm running OSX 10.5.2 I just upgraded to Firefox 11.0. Firefox runs, but no windows can be seen.

See also:
*http://kb.mozillazine.org/Corrupt_localstore.rdf
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
*Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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).

Can't install update to 3.6.14 even after making sure there is no other firefox running, and even after reboot.

Currently using 3.6.13. Received indication of update to 3.6.14, but restarting Firefox produces a box that says "Can't install the update, make sure there is no other Firefox version running."
There is no other Firefox running. I tried several times, with same results. Used "End process" from task manager instead of normal exit from Firefox, with same results. Shut down and rebooted the computer, and Firefox still shows the same problem.

"Private Browsing" with "Anonymizer Never Cookie" starts a second copy of Firefox, which apparently doesn't entirely go away after use. I started Firefox, went to Private Browsing, and then used Task Manager to "End Process Tree" for both Firefox processes. I then started Firefox again, and the update worked correctly.

After a start-up I'm told "Firefox update cannot be completed, Please close existing Firefox. There is no other Firefox running after a fresh start-up.

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